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8x-31+5x=-20+3x-71
We move all terms to the left:
8x-31+5x-(-20+3x-71)=0
We add all the numbers together, and all the variables
8x+5x-(3x-91)-31=0
We add all the numbers together, and all the variables
13x-(3x-91)-31=0
We get rid of parentheses
13x-3x+91-31=0
We add all the numbers together, and all the variables
10x+60=0
We move all terms containing x to the left, all other terms to the right
10x=-60
x=-60/10
x=-6
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