3a=9(4-a)

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Solution for 3a=9(4-a) equation: 



3a=9(4-a)

We move all terms to the left:

3a-(9(4-a))=0

We add all the numbers together, and all the variables

3a-(9(-1a+4))=0



We calculate terms in parentheses: -(9(-1a+4)), so:

9(-1a+4)

We multiply parentheses

-9a+36

Back to the equation:

-(-9a+36)



We get rid of parentheses

3a+9a-36=0

We add all the numbers together, and all the variables

12a-36=0

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

12a=36

a=36/12

a=3

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