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