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20=-12+x
We move all terms to the left:
20-(-12+x)=0
We add all the numbers together, and all the variables
-(x-12)+20=0
We get rid of parentheses
-x+12+20=0
We add all the numbers together, and all the variables
-1x+32=0
We move all terms containing x to the left, all other terms to the right
-x=-32
x=-32/-1
x=+32
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