2a+a+9=6

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Solution for 2a+a+9=6 equation: 



2a+a+9=6

We move all terms to the left:

2a+a+9-(6)=0

We add all the numbers together, and all the variables

3a+3=0

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

3a=-3

a=-3/3

a=-1

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