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20=4h-4
We move all terms to the left:
20-(4h-4)=0
We get rid of parentheses
-4h+4+20=0
We add all the numbers together, and all the variables
-4h+24=0
We move all terms containing h to the left, all other terms to the right
-4h=-24
h=-24/-4
h=+6
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