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20=4h+4h=
We move all terms to the left:
20-(4h+4h)=0
We add all the numbers together, and all the variables
-(+8h)+20=0
We get rid of parentheses
-8h+20=0
We move all terms containing h to the left, all other terms to the right
-8h=-20
h=-20/-8
h=2+1/2
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