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(3x+-1)+31+90=108
We move all terms to the left:
(3x+-1)+31+90-(108)=0
We add all the numbers together, and all the variables
(3x-1)+31+90-108=0
We add all the numbers together, and all the variables
(3x-1)+13=0
We get rid of parentheses
3x-1+13=0
We add all the numbers together, and all the variables
3x+12=0
We move all terms containing x to the left, all other terms to the right
3x=-12
x=-12/3
x=-4
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