9a-7-3a=-15

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Solution for 9a-7-3a=-15 equation: 



9a-7-3a=-15

We move all terms to the left:

9a-7-3a-(-15)=0

We add all the numbers together, and all the variables

6a+8=0

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

6a=-8

a=-8/6

a=-1+1/3

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