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13=2h+7
We move all terms to the left:
13-(2h+7)=0
We get rid of parentheses
-2h-7+13=0
We add all the numbers together, and all the variables
-2h+6=0
We move all terms containing h to the left, all other terms to the right
-2h=-6
h=-6/-2
h=+3
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