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(7x+29)+(11x-31)=135
We move all terms to the left:
(7x+29)+(11x-31)-(135)=0
We get rid of parentheses
7x+11x+29-31-135=0
We add all the numbers together, and all the variables
18x-137=0
We move all terms containing x to the left, all other terms to the right
18x=137
x=137/18
x=7+11/18
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