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77=15+2h
We move all terms to the left:
77-(15+2h)=0
We add all the numbers together, and all the variables
-(2h+15)+77=0
We get rid of parentheses
-2h-15+77=0
We add all the numbers together, and all the variables
-2h+62=0
We move all terms containing h to the left, all other terms to the right
-2h=-62
h=-62/-2
h=+31
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