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3x+8=-13x
We move all terms to the left:
3x+8-(-13x)=0
We get rid of parentheses
3x+13x+8=0
We add all the numbers together, and all the variables
16x+8=0
We move all terms containing x to the left, all other terms to the right
16x=-8
x=-8/16
x=-1/2
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