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(10x+2)+(11x-11)=138
We move all terms to the left:
(10x+2)+(11x-11)-(138)=0
We get rid of parentheses
10x+11x+2-11-138=0
We add all the numbers together, and all the variables
21x-147=0
We move all terms containing x to the left, all other terms to the right
21x=147
x=147/21
x=7
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