15=6a+9a

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Solution for 15=6a+9a equation: 



15=6a+9a

We move all terms to the left:

15-(6a+9a)=0

We add all the numbers together, and all the variables

-(+15a)+15=0

We get rid of parentheses

-15a+15=0

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

-15a=-15

a=-15/-15

a=1

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