3a+9+a=15

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Solution for 3a+9+a=15 equation: 



3a+9+a=15

We move all terms to the left:

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

We add all the numbers together, and all the variables

4a-6=0

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

4a=6

a=6/4

a=1+1/2

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