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2x+20+3x-10+2x-10+2x=540
We move all terms to the left:
2x+20+3x-10+2x-10+2x-(540)=0
We add all the numbers together, and all the variables
9x-540=0
We move all terms containing x to the left, all other terms to the right
9x=540
x=540/9
x=60
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