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42=18+8h
We move all terms to the left:
42-(18+8h)=0
We add all the numbers together, and all the variables
-(8h+18)+42=0
We get rid of parentheses
-8h-18+42=0
We add all the numbers together, and all the variables
-8h+24=0
We move all terms containing h to the left, all other terms to the right
-8h=-24
h=-24/-8
h=+3
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