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3x-5(-x=13)=31
We move all terms to the left:
3x-5(-x-(13))=0
We add all the numbers together, and all the variables
3x-5(-1x-13)=0
We multiply parentheses
3x+5x+65=0
We add all the numbers together, and all the variables
8x+65=0
We move all terms containing x to the left, all other terms to the right
8x=-65
x=-65/8
x=-8+1/8
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