6-12+3a=15

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Solution for 6-12+3a=15 equation: 



6-12+3a=15

We move all terms to the left:

6-12+3a-(15)=0

We add all the numbers together, and all the variables

3a-21=0

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

3a=21

a=21/3

a=7

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