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-6+x=15-2x
We move all terms to the left:
-6+x-(15-2x)=0
We add all the numbers together, and all the variables
x-(-2x+15)-6=0
We get rid of parentheses
x+2x-15-6=0
We add all the numbers together, and all the variables
3x-21=0
We move all terms containing x to the left, all other terms to the right
3x=21
x=21/3
x=7
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