66=-7a-(9+8a)

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Solution for 66=-7a-(9+8a) equation: 



66=-7a-(9+8a)

We move all terms to the left:

66-(-7a-(9+8a))=0

We add all the numbers together, and all the variables

-(-7a-(8a+9))+66=0



We calculate terms in parentheses: -(-7a-(8a+9)), so:

-7a-(8a+9)

We get rid of parentheses

-7a-8a-9

We add all the numbers together, and all the variables

-15a-9

Back to the equation:

-(-15a-9)



We get rid of parentheses

15a+9+66=0

We add all the numbers together, and all the variables

15a+75=0

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

15a=-75

a=-75/15

a=-5

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