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20+6h=-7h-20+15h
We move all terms to the left:
20+6h-(-7h-20+15h)=0
We add all the numbers together, and all the variables
6h-(8h-20)+20=0
We get rid of parentheses
6h-8h+20+20=0
We add all the numbers together, and all the variables
-2h+40=0
We move all terms containing h to the left, all other terms to the right
-2h=-40
h=-40/-2
h=+20
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