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9h+(-2h)-(-1)=(-13)
We move all terms to the left:
9h+(-2h)-(-1)-((-13))=0
We add all the numbers together, and all the variables
9h+(-2h)+14=0
We get rid of parentheses
9h-2h+14=0
We add all the numbers together, and all the variables
7h+14=0
We move all terms containing h to the left, all other terms to the right
7h=-14
h=-14/7
h=-2
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