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57=21-x+9-x
We move all terms to the left:
57-(21-x+9-x)=0
We add all the numbers together, and all the variables
-(-2x+30)+57=0
We get rid of parentheses
2x-30+57=0
We add all the numbers together, and all the variables
2x+27=0
We move all terms containing x to the left, all other terms to the right
2x=-27
x=-27/2
x=-13+1/2
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