-2(a+12)=a-9

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Solution for -2(a+12)=a-9 equation: 



-2(a+12)=a-9

We move all terms to the left:

-2(a+12)-(a-9)=0

We multiply parentheses

-2a-(a-9)-24=0

We get rid of parentheses

-2a-a+9-24=0

We add all the numbers together, and all the variables

-3a-15=0

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

-3a=15

a=15/-3

a=-5

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