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13-4x=-8x-8
We move all terms to the left:
13-4x-(-8x-8)=0
We get rid of parentheses
-4x+8x+8+13=0
We add all the numbers together, and all the variables
4x+21=0
We move all terms containing x to the left, all other terms to the right
4x=-21
x=-21/4
x=-5+1/4
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