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x+(2x-255)=180
We move all terms to the left:
x+(2x-255)-(180)=0
We get rid of parentheses
x+2x-255-180=0
We add all the numbers together, and all the variables
3x-435=0
We move all terms containing x to the left, all other terms to the right
3x=435
x=435/3
x=145
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