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12=4h+4
We move all terms to the left:
12-(4h+4)=0
We get rid of parentheses
-4h-4+12=0
We add all the numbers together, and all the variables
-4h+8=0
We move all terms containing h to the left, all other terms to the right
-4h=-8
h=-8/-4
h=+2
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