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