5a+7a+9=-15

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Solution for 5a+7a+9=-15 equation: 



5a+7a+9=-15

We move all terms to the left:

5a+7a+9-(-15)=0

We add all the numbers together, and all the variables

12a+24=0

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

12a=-24

a=-24/12

a=-2

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