8-20=3x-21

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Solution for 8-20=3x-21 equation: 



8-20=3x-21

We move all terms to the left:

8-20-(3x-21)=0

We add all the numbers together, and all the variables

-(3x-21)-12=0

We get rid of parentheses

-3x+21-12=0

We add all the numbers together, and all the variables

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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