3a+12-5a=-9

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Solution for 3a+12-5a=-9 equation: 



3a+12-5a=-9

We move all terms to the left:

3a+12-5a-(-9)=0

We add all the numbers together, and all the variables

-2a+21=0

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

-2a=-21

a=-21/-2

a=10+1/2

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