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2x-(15-x)=21
We move all terms to the left:
2x-(15-x)-(21)=0
We add all the numbers together, and all the variables
2x-(-1x+15)-21=0
We get rid of parentheses
2x+1x-15-21=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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