6+3a=12a-15

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



6+3a=12a-15

We move all terms to the left:

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

We get rid of parentheses

3a-12a+15+6=0

We add all the numbers together, and all the variables

-9a+21=0

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

-9a=-21

a=-21/-9

a=2+1/3

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