-15=-3(a+6)

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Solution for -15=-3(a+6) equation: 



-15=-3(a+6)

We move all terms to the left:

-15-(-3(a+6))=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+18-15=0

We add all the numbers together, and all the variables

3a+3=0

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

3a=-3

a=-3/3

a=-1

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