4a-9=3(a+4)

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



4a-9=3(a+4)

We move all terms to the left:

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



We calculate terms in parentheses: -(3(a+4)), so:

3(a+4)

We multiply parentheses

3a+12

Back to the equation:

-(3a+12)



We get rid of parentheses

4a-3a-12-9=0

We add all the numbers together, and all the variables

a-21=0

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

a=21

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