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(x+31)+(4x-16)=140
We move all terms to the left:
(x+31)+(4x-16)-(140)=0
We get rid of parentheses
x+4x+31-16-140=0
We add all the numbers together, and all the variables
5x-125=0
We move all terms containing x to the left, all other terms to the right
5x=125
x=125/5
x=25
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