3a-21=3(3a-5)

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Solution for 3a-21=3(3a-5) equation: 



3a-21=3(3a-5)

We move all terms to the left:

3a-21-(3(3a-5))=0



We calculate terms in parentheses: -(3(3a-5)), so:

3(3a-5)

We multiply parentheses

9a-15

Back to the equation:

-(9a-15)



We get rid of parentheses

3a-9a+15-21=0

We add all the numbers together, and all the variables

-6a-6=0

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

-6a=6

a=6/-6

a=-1

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