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3(h+4)=-9
We move all terms to the left:
3(h+4)-(-9)=0
We add all the numbers together, and all the variables
3(h+4)+9=0
We multiply parentheses
3h+12+9=0
We add all the numbers together, and all the variables
3h+21=0
We move all terms containing h to the left, all other terms to the right
3h=-21
h=-21/3
h=-7
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