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-8-13=15h-8h
We move all terms to the left:
-8-13-(15h-8h)=0
We add all the numbers together, and all the variables
-(+7h)-8-13=0
We add all the numbers together, and all the variables
-(+7h)-21=0
We get rid of parentheses
-7h-21=0
We move all terms containing h to the left, all other terms to the right
-7h=21
h=21/-7
h=-3
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