12a+3a=5

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Solution for 12a+3a=5 equation: 



12a+3a=5

We move all terms to the left:

12a+3a-(5)=0

We add all the numbers together, and all the variables

15a-5=0

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

15a=5

a=5/15

a=1/3

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