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2x+20+2x+50+5x+30=360
We move all terms to the left:
2x+20+2x+50+5x+30-(360)=0
We add all the numbers together, and all the variables
9x-260=0
We move all terms containing x to the left, all other terms to the right
9x=260
x=260/9
x=28+8/9
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