15=3(3-a)

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Solution for 15=3(3-a) equation: 



15=3(3-a)

We move all terms to the left:

15-(3(3-a))=0

We add all the numbers together, and all the variables

-(3(-1a+3))+15=0



We calculate terms in parentheses: -(3(-1a+3)), so:

3(-1a+3)

We multiply parentheses

-3a+9

Back to the equation:

-(-3a+9)



We get rid of parentheses

3a-9+15=0

We add all the numbers together, and all the variables

3a+6=0

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

3a=-6

a=-6/3

a=-2

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