-9(6+a)=45

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Solution for -9(6+a)=45 equation: 



-9(6+a)=45

We move all terms to the left:

-9(6+a)-(45)=0

We add all the numbers together, and all the variables

-9(a+6)-45=0

We multiply parentheses

-9a-54-45=0

We add all the numbers together, and all the variables

-9a-99=0

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

-9a=99

a=99/-9

a=-11

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