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-8=15x-8x+13
We move all terms to the left:
-8-(15x-8x+13)=0
We add all the numbers together, and all the variables
-(7x+13)-8=0
We get rid of parentheses
-7x-13-8=0
We add all the numbers together, and all the variables
-7x-21=0
We move all terms containing x to the left, all other terms to the right
-7x=21
x=21/-7
x=-3
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