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h+2(h-3)=9
We move all terms to the left:
h+2(h-3)-(9)=0
We multiply parentheses
h+2h-6-9=0
We add all the numbers together, and all the variables
3h-15=0
We move all terms containing h to the left, all other terms to the right
3h=15
h=15/3
h=5
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