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20=2h+2h
We move all terms to the left:
20-(2h+2h)=0
We add all the numbers together, and all the variables
-(+4h)+20=0
We get rid of parentheses
-4h+20=0
We move all terms containing h to the left, all other terms to the right
-4h=-20
h=-20/-4
h=+5
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