3a+9=a-3

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



3a+9=a-3

We move all terms to the left:

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

We get rid of parentheses

3a-a+3+9=0

We add all the numbers together, and all the variables

2a+12=0

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

2a=-12

a=-12/2

a=-6

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