21=(-7)m

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Solution for 21=(-7)m equation: 



21=(-7)m

We move all terms to the left:

21-((-7)m)=0



We calculate terms in parentheses: -((-7)m), so:

(-7)m

We multiply parentheses

-7m

Back to the equation:

-(-7m)



We get rid of parentheses

7m+21=0

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

7m=-21

m=-21/7

m=-3

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