72=-3(6+a)

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Solution for 72=-3(6+a) equation: 



72=-3(6+a)

We move all terms to the left:

72-(-3(6+a))=0

We add all the numbers together, and all the variables

-(-3(a+6))+72=0



We calculate terms in parentheses: -(-3(a+6)), so:

-3(a+6)

We multiply parentheses

-3a-18

Back to the equation:

-(-3a-18)



We get rid of parentheses

3a+18+72=0

We add all the numbers together, and all the variables

3a+90=0

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

3a=-90

a=-90/3

a=-30

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