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h=3h-20
We move all terms to the left:
h-(3h-20)=0
We get rid of parentheses
h-3h+20=0
We add all the numbers together, and all the variables
-2h+20=0
We move all terms containing h to the left, all other terms to the right
-2h=-20
h=-20/-2
h=+10
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