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31=2h+17
We move all terms to the left:
31-(2h+17)=0
We get rid of parentheses
-2h-17+31=0
We add all the numbers together, and all the variables
-2h+14=0
We move all terms containing h to the left, all other terms to the right
-2h=-14
h=-14/-2
h=+7
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