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12+4h=20+2h
We move all terms to the left:
12+4h-(20+2h)=0
We add all the numbers together, and all the variables
4h-(2h+20)+12=0
We get rid of parentheses
4h-2h-20+12=0
We add all the numbers together, and all the variables
2h-8=0
We move all terms containing h to the left, all other terms to the right
2h=8
h=8/2
h=4
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