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3x+20=180+2x+80
We move all terms to the left:
3x+20-(180+2x+80)=0
We add all the numbers together, and all the variables
3x-(2x+260)+20=0
We get rid of parentheses
3x-2x-260+20=0
We add all the numbers together, and all the variables
x-240=0
We move all terms containing x to the left, all other terms to the right
x=240
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