81=-3(-4a-7)

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Solution for 81=-3(-4a-7) equation: 



81=-3(-4a-7)

We move all terms to the left:

81-(-3(-4a-7))=0



We calculate terms in parentheses: -(-3(-4a-7)), so:

-3(-4a-7)

We multiply parentheses

12a+21

Back to the equation:

-(12a+21)



We get rid of parentheses

-12a-21+81=0

We add all the numbers together, and all the variables

-12a+60=0

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

-12a=-60

a=-60/-12

a=+5

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