12a+3a-2a=4

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Solution for 12a+3a-2a=4 equation: 



12a+3a-2a=4

We move all terms to the left:

12a+3a-2a-(4)=0

We add all the numbers together, and all the variables

13a-4=0

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

13a=4

a=4/13

a=4/13

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