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7h+84=5h-18
We move all terms to the left:
7h+84-(5h-18)=0
We get rid of parentheses
7h-5h+18+84=0
We add all the numbers together, and all the variables
2h+102=0
We move all terms containing h to the left, all other terms to the right
2h=-102
h=-102/2
h=-51
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