15-a=2(a-9)

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Solution for 15-a=2(a-9) equation: 



15-a=2(a-9)

We move all terms to the left:

15-a-(2(a-9))=0

We add all the numbers together, and all the variables

-1a-(2(a-9))+15=0



We calculate terms in parentheses: -(2(a-9)), so:

2(a-9)

We multiply parentheses

2a-18

Back to the equation:

-(2a-18)



We get rid of parentheses

-1a-2a+18+15=0

We add all the numbers together, and all the variables

-3a+33=0

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

-3a=-33

a=-33/-3

a=+11

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