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12=h-3+8
We move all terms to the left:
12-(h-3+8)=0
We add all the numbers together, and all the variables
-(h+5)+12=0
We get rid of parentheses
-h-5+12=0
We add all the numbers together, and all the variables
-1h+7=0
We move all terms containing h to the left, all other terms to the right
-h=-7
h=-7/-1
h=+7
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