21=3(q-72)

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Solution for 21=3(q-72) equation: 



21=3(q-72)

We move all terms to the left:

21-(3(q-72))=0



We calculate terms in parentheses: -(3(q-72)), so:

3(q-72)

We multiply parentheses

3q-216

Back to the equation:

-(3q-216)



We get rid of parentheses

-3q+216+21=0

We add all the numbers together, and all the variables

-3q+237=0

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

-3q=-237

q=-237/-3

q=+79

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