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