12a-15+6=3a+9

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Solution for 12a-15+6=3a+9 equation: 



12a-15+6=3a+9

We move all terms to the left:

12a-15+6-(3a+9)=0

We add all the numbers together, and all the variables

12a-(3a+9)-9=0

We get rid of parentheses

12a-3a-9-9=0

We add all the numbers together, and all the variables

9a-18=0

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

9a=18

a=18/9

a=2

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