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3x-20+x-20+x-9+x-1=180
We move all terms to the left:
3x-20+x-20+x-9+x-1-(180)=0
We add all the numbers together, and all the variables
6x-230=0
We move all terms containing x to the left, all other terms to the right
6x=230
x=230/6
x=38+1/3
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