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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:We get rid of parentheses
-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)
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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