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3h=12+4h
We move all terms to the left:
3h-(12+4h)=0
We add all the numbers together, and all the variables
3h-(4h+12)=0
We get rid of parentheses
3h-4h-12=0
We add all the numbers together, and all the variables
-1h-12=0
We move all terms containing h to the left, all other terms to the right
-h=12
h=12/-1
h=-12
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