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7h-13=3h-21
We move all terms to the left:
7h-13-(3h-21)=0
We get rid of parentheses
7h-3h+21-13=0
We add all the numbers together, and all the variables
4h+8=0
We move all terms containing h to the left, all other terms to the right
4h=-8
h=-8/4
h=-2
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