-9+21=-4+3x

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Solution for -9+21=-4+3x equation: 



-9+21=-4+3x

We move all terms to the left:

-9+21-(-4+3x)=0

We add all the numbers together, and all the variables

-(3x-4)-9+21=0

We add all the numbers together, and all the variables

-(3x-4)+12=0

We get rid of parentheses

-3x+4+12=0

We add all the numbers together, and all the variables

-3x+16=0

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

-3x=-16

x=-16/-3

x=5+1/3

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