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13=2x-15+x-2+3
We move all terms to the left:
13-(2x-15+x-2+3)=0
We add all the numbers together, and all the variables
-(3x-14)+13=0
We get rid of parentheses
-3x+14+13=0
We add all the numbers together, and all the variables
-3x+27=0
We move all terms containing x to the left, all other terms to the right
-3x=-27
x=-27/-3
x=+9
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