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12=-3+h
We move all terms to the left:
12-(-3+h)=0
We add all the numbers together, and all the variables
-(h-3)+12=0
We get rid of parentheses
-h+3+12=0
We add all the numbers together, and all the variables
-1h+15=0
We move all terms containing h to the left, all other terms to the right
-h=-15
h=-15/-1
h=+15
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