21=3(q-80)

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Solution for 21=3(q-80) equation: 



21=3(q-80)

We move all terms to the left:

21-(3(q-80))=0



We calculate terms in parentheses: -(3(q-80)), so:

3(q-80)

We multiply parentheses

3q-240

Back to the equation:

-(3q-240)



We get rid of parentheses

-3q+240+21=0

We add all the numbers together, and all the variables

-3q+261=0

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

-3q=-261

q=-261/-3

q=+87

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