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x+(x-23)=129
We move all terms to the left:
x+(x-23)-(129)=0
We get rid of parentheses
x+x-23-129=0
We add all the numbers together, and all the variables
2x-152=0
We move all terms containing x to the left, all other terms to the right
2x=152
x=152/2
x=76
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