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-13+x=8x-20x
We move all terms to the left:
-13+x-(8x-20x)=0
We add all the numbers together, and all the variables
x-(-12x)-13=0
We get rid of parentheses
x+12x-13=0
We add all the numbers together, and all the variables
13x-13=0
We move all terms containing x to the left, all other terms to the right
13x=13
x=13/13
x=1
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