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12+h/3=15
We move all terms to the left:
12+h/3-(15)=0
We add all the numbers together, and all the variables
h/3-3=0
We multiply all the terms by the denominator
h-3*3=0
We add all the numbers together, and all the variables
h-9=0
We move all terms containing h to the left, all other terms to the right
h=9
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