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31=3h+4
We move all terms to the left:
31-(3h+4)=0
We get rid of parentheses
-3h-4+31=0
We add all the numbers together, and all the variables
-3h+27=0
We move all terms containing h to the left, all other terms to the right
-3h=-27
h=-27/-3
h=+9
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