-21=-7(3x+4)+21x

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Solution for -21=-7(3x+4)+21x equation: 



-21=-7(3x+4)+21x

We move all terms to the left:

-21-(-7(3x+4)+21x)=0



We calculate terms in parentheses: -(-7(3x+4)+21x), so:

-7(3x+4)+21x

We add all the numbers together, and all the variables

21x-7(3x+4)

We multiply parentheses

21x-21x-28

We add all the numbers together, and all the variables

-28

Back to the equation:

-(-28)



We add all the numbers together, and all the variables

7!=0

There is no solution for this equation

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