21(-3)=m

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Solution for 21(-3)=m equation: 



21(-3)=m

We move all terms to the left:

21(-3)-(m)=0

We add all the numbers together, and all the variables

-1m-63=0

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

-m=63

m=63/-1

m=-63

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