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-20=-2x+7x

We move all terms to the left:

-20-(-2x+7x)=0

We add all the numbers together, and all the variables

-(+5x)-20=0

We get rid of parentheses

-5x-20=0

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

-5x=20

x=20/-5

x=-4

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