9=-3(q-20)

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



9=-3(q-20)

We move all terms to the left:

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



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

-3(q-20)

We multiply parentheses

-3q+60

Back to the equation:

-(-3q+60)



We get rid of parentheses

3q-60+9=0

We add all the numbers together, and all the variables

3q-51=0

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

3q=51

q=51/3

q=17

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