20=-3x-4x-8

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Solution for 20=-3x-4x-8 equation: 



20=-3x-4x-8

We move all terms to the left:

20-(-3x-4x-8)=0

We add all the numbers together, and all the variables

-(-7x-8)+20=0

We get rid of parentheses

7x+8+20=0

We add all the numbers together, and all the variables

7x+28=0

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

7x=-28

x=-28/7

x=-4

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