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39=12+9h
We move all terms to the left:
39-(12+9h)=0
We add all the numbers together, and all the variables
-(9h+12)+39=0
We get rid of parentheses
-9h-12+39=0
We add all the numbers together, and all the variables
-9h+27=0
We move all terms containing h to the left, all other terms to the right
-9h=-27
h=-27/-9
h=+3
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