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89=9+8h
We move all terms to the left:
89-(9+8h)=0
We add all the numbers together, and all the variables
-(8h+9)+89=0
We get rid of parentheses
-8h-9+89=0
We add all the numbers together, and all the variables
-8h+80=0
We move all terms containing h to the left, all other terms to the right
-8h=-80
h=-80/-8
h=+10
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