-6a+9+9=4a-4a-12

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Solution for -6a+9+9=4a-4a-12 equation: 



-6a+9+9=4a-4a-12

We move all terms to the left:

-6a+9+9-(4a-4a-12)=0

We add all the numbers together, and all the variables

-6a+9+9-(-12)=0

We add all the numbers together, and all the variables

-6a+30=0

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

-6a=-30

a=-30/-6

a=+5

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