(9+3a)=15

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Solution for (9+3a)=15 equation: 



(9+3a)=15

We move all terms to the left:

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

We add all the numbers together, and all the variables

(3a+9)-15=0

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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