9=-3(m-20)

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Solution for 9=-3(m-20) equation: 



9=-3(m-20)

We move all terms to the left:

9-(-3(m-20))=0



We calculate terms in parentheses: -(-3(m-20)), so:

-3(m-20)

We multiply parentheses

-3m+60

Back to the equation:

-(-3m+60)



We get rid of parentheses

3m-60+9=0

We add all the numbers together, and all the variables

3m-51=0

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

3m=51

m=51/3

m=17

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