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-86+8x=159+15x
We move all terms to the left:
-86+8x-(159+15x)=0
We add all the numbers together, and all the variables
8x-(15x+159)-86=0
We get rid of parentheses
8x-15x-159-86=0
We add all the numbers together, and all the variables
-7x-245=0
We move all terms containing x to the left, all other terms to the right
-7x=245
x=245/-7
x=-35
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