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81=15+2h
We move all terms to the left:
81-(15+2h)=0
We add all the numbers together, and all the variables
-(2h+15)+81=0
We get rid of parentheses
-2h-15+81=0
We add all the numbers together, and all the variables
-2h+66=0
We move all terms containing h to the left, all other terms to the right
-2h=-66
h=-66/-2
h=+33
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