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2x+(x+100)=260
We move all terms to the left:
2x+(x+100)-(260)=0
We get rid of parentheses
2x+x+100-260=0
We add all the numbers together, and all the variables
3x-160=0
We move all terms containing x to the left, all other terms to the right
3x=160
x=160/3
x=53+1/3
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