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x+5=-3x-13
We move all terms to the left:
x+5-(-3x-13)=0
We get rid of parentheses
x+3x+13+5=0
We add all the numbers together, and all the variables
4x+18=0
We move all terms containing x to the left, all other terms to the right
4x=-18
x=-18/4
x=-4+1/2
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