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12=3h+6
We move all terms to the left:
12-(3h+6)=0
We get rid of parentheses
-3h-6+12=0
We add all the numbers together, and all the variables
-3h+6=0
We move all terms containing h to the left, all other terms to the right
-3h=-6
h=-6/-3
h=+2
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