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3(h+12)-13=-4
We move all terms to the left:
3(h+12)-13-(-4)=0
We add all the numbers together, and all the variables
3(h+12)-9=0
We multiply parentheses
3h+36-9=0
We add all the numbers together, and all the variables
3h+27=0
We move all terms containing h to the left, all other terms to the right
3h=-27
h=-27/3
h=-9
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