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3x-5=-x-13
We move all terms to the left:
3x-5-(-x-13)=0
We add all the numbers together, and all the variables
3x-(-1x-13)-5=0
We get rid of parentheses
3x+1x+13-5=0
We add all the numbers together, and all the variables
4x+8=0
We move all terms containing x to the left, all other terms to the right
4x=-8
x=-8/4
x=-2
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