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3x+20+3x+20+3x+20=180
We move all terms to the left:
3x+20+3x+20+3x+20-(180)=0
We add all the numbers together, and all the variables
9x-120=0
We move all terms containing x to the left, all other terms to the right
9x=120
x=120/9
x=13+1/3
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