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7h+12=2h-13=
We move all terms to the left:
7h+12-(2h-13)=0
We get rid of parentheses
7h-2h+13+12=0
We add all the numbers together, and all the variables
5h+25=0
We move all terms containing h to the left, all other terms to the right
5h=-25
h=-25/5
h=-5
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