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7h-24=2h+21
We move all terms to the left:
7h-24-(2h+21)=0
We get rid of parentheses
7h-2h-21-24=0
We add all the numbers together, and all the variables
5h-45=0
We move all terms containing h to the left, all other terms to the right
5h=45
h=45/5
h=9
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