I'll add to the above in saying that Iran has no fixed rule as to the number of grouped armored vehicles supporting ground units-- the number fluctuates between operational environment and operational priorities in peacetime and situational priorities during wartime. So where as it is a reasonably safe to assume that roughly 34 tanks per each battalion provide support this isn't uniform.
The other point to note is that heavy armored units, such as armored brigades, aren't given a major tactical pinning as independent segments. In that sense, armor isn't the major component of the ground forces of Iran for that matter as well especially given Iran's limited numbers. Hence, in most cases we see units scattered alongside other mechanized infantry units in which they are roughly equivalent. On an operational footing, this allows Iran's limited armored assets to be more dispersed-- i.e in the form of what is often militarily termed as mobile 'fire-fighting' teams moving up and down the lines to tackle breaks rather then conducting concentrated armored assaults. The inherent compromise in this is that such a strategy does not allow for concentrated groupings, puts the onus on infantry support groups, and becomes increasingly difficult when confronting dedicated heavy armored assaults of a more sophisticated enemy. On the other hand, given an enemy with almost equally limited armored formations, it forces them to divert resources proportionally. As such, say in comparison to similar NATO formations, Iranian armor based groups are considerably lighter.
Hence, Iranian armored formations in a tactical sense are more properly varying combined arms groups having both armor and infantry as more organic components. Of course alongside these there are the more usual artillery, AA and signals teams. As a consequence, whereas in most modern (largely Cold War) military doctrines, tanks form a major impetus of such a group, Iranian combinations see them as more independent support units. I hope this helps.
"My Lord, grant me success in struggling during failure, in having patience in disappointment, in going alone, in Jihad without weapons, in working without pay, in making sacrifice in silence, in having religious belief in the world, in having ideology without popular traditions, in having faith without pretensions, non-conformity without immaturity, beauty without physical appearance, loneliness in the crowd, and loving without the beloved knowing about it. My Lord, You teach me how to live; I shall learn how to die."
- Ali Shariati