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8+h=12+3h
We move all terms to the left:
8+h-(12+3h)=0
We add all the numbers together, and all the variables
h-(3h+12)+8=0
We get rid of parentheses
h-3h-12+8=0
We add all the numbers together, and all the variables
-2h-4=0
We move all terms containing h to the left, all other terms to the right
-2h=4
h=4/-2
h=-2
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