8-20=-3x

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Solution for 8-20=-3x equation: 



8-20=-3x

We move all terms to the left:

8-20-(-3x)=0

We add all the numbers together, and all the variables

-(-3x)-12=0

We get rid of parentheses

3x-12=0

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

3x=12

x=12/3

x=4

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