2a+9=12

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Solution for 2a+9=12 equation: 



2a+9=12

We move all terms to the left:

2a+9-(12)=0

We add all the numbers together, and all the variables

2a-3=0

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

2a=3

a=3/2

a=1+1/2

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