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2x-40=8x+20=180
We move all terms to the left:
2x-40-(8x+20)=0
We get rid of parentheses
2x-8x-20-40=0
We add all the numbers together, and all the variables
-6x-60=0
We move all terms containing x to the left, all other terms to the right
-6x=60
x=60/-6
x=-10
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