3+2a=12

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Solution for 3+2a=12 equation: 



3+2a=12

We move all terms to the left:

3+2a-(12)=0

We add all the numbers together, and all the variables

2a-9=0

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

2a=9

a=9/2

a=4+1/2

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