20=-3x-7x

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Solution for 20=-3x-7x equation: 



20=-3x-7x

We move all terms to the left:

20-(-3x-7x)=0

We add all the numbers together, and all the variables

-(-10x)+20=0

We get rid of parentheses

10x+20=0

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

10x=-20

x=-20/10

x=-2

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