2x-40=8x+20=180

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Solution for 2x-40=8x+20=180 equation: 



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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