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x+(x-25)=109
We move all terms to the left:
x+(x-25)-(109)=0
We get rid of parentheses
x+x-25-109=0
We add all the numbers together, and all the variables
2x-134=0
We move all terms containing x to the left, all other terms to the right
2x=134
x=134/2
x=67
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