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3x+(2x+20)=260
We move all terms to the left:
3x+(2x+20)-(260)=0
We get rid of parentheses
3x+2x+20-260=0
We add all the numbers together, and all the variables
5x-240=0
We move all terms containing x to the left, all other terms to the right
5x=240
x=240/5
x=48
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