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x+40+2x+20+3x-20=180
We move all terms to the left:
x+40+2x+20+3x-20-(180)=0
We add all the numbers together, and all the variables
6x-140=0
We move all terms containing x to the left, all other terms to the right
6x=140
x=140/6
x=23+1/3
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