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2(h-3)=7
We move all terms to the left:
2(h-3)-(7)=0
We multiply parentheses
2h-6-7=0
We add all the numbers together, and all the variables
2h-13=0
We move all terms containing h to the left, all other terms to the right
2h=13
h=13/2
h=6+1/2
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