21=3(g-80)

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



21=3(g-80)

We move all terms to the left:

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



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

3(g-80)

We multiply parentheses

3g-240

Back to the equation:

-(3g-240)



We get rid of parentheses

-3g+240+21=0

We add all the numbers together, and all the variables

-3g+261=0

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

-3g=-261

g=-261/-3

g=+87

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