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5(3+h)=15+45
We move all terms to the left:
5(3+h)-(15+45)=0
We add all the numbers together, and all the variables
5(h+3)-60=0
We multiply parentheses
5h+15-60=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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