(m-21-)=4

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Solution for (m-21-)=4 equation: 



(m-21-)=4

We move all terms to the left:

(m-21-)-(4)=0

We add all the numbers together, and all the variables

(+m)-4=0

We get rid of parentheses

m-4=0

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

m=4

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