3x(-7)=3x+21

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Solution for 3x(-7)=3x+21 equation: 



3x(-7)=3x+21

We move all terms to the left:

3x(-7)-(3x+21)=0

We multiply parentheses

-21x-(3x+21)=0

We get rid of parentheses

-21x-3x-21=0

We add all the numbers together, and all the variables

-24x-21=0

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

-24x=21

x=21/-24

x=-7/8

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