15-a=3(a-3)

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



15-a=3(a-3)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

3(a-3)

We multiply parentheses

3a-9

Back to the equation:

-(3a-9)



We get rid of parentheses

-1a-3a+9+15=0

We add all the numbers together, and all the variables

-4a+24=0

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

-4a=-24

a=-24/-4

a=+6

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