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4x-(-13x)-4x=-13
We move all terms to the left:
4x-(-13x)-4x-(-13)=0
We add all the numbers together, and all the variables
-(-13x)+13=0
We get rid of parentheses
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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