x-20=3x+40

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Solution for x-20=3x+40 equation: 



x-20=3x+40

We move all terms to the left:

x-20-(3x+40)=0

We get rid of parentheses

x-3x-40-20=0

We add all the numbers together, and all the variables

-2x-60=0

We move all terms containing x to the left, all other terms to the right

-2x=60

x=60/-2

x=-30

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