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(3h+20)=7
We move all terms to the left:
(3h+20)-(7)=0
We get rid of parentheses
3h+20-7=0
We add all the numbers together, and all the variables
3h+13=0
We move all terms containing h to the left, all other terms to the right
3h=-13
h=-13/3
h=-4+1/3
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