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(10+x)=128
We move all terms to the left:
(10+x)-(128)=0
We add all the numbers together, and all the variables
(x+10)-128=0
We get rid of parentheses
x+10-128=0
We add all the numbers together, and all the variables
x-118=0
We move all terms containing x to the left, all other terms to the right
x=118
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