6a-21=-3+2(6+6a)

Solution for 6a-21=-3+2(6+6a) equation:

6a-21=-3+2(6+6a)

We move all terms to the left:

6a-21-(-3+2(6+6a))=0

We add all the numbers together, and all the variables

6a-(-3+2(6a+6))-21=0


We calculate terms in parentheses: -(-3+2(6a+6)), so:

-3+2(6a+6)

determiningTheFunctionDomain
2(6a+6)-3

We multiply parentheses

12a+12-3

We add all the numbers together, and all the variables

12a+9

Back to the equation:

-(12a+9)


We get rid of parentheses

6a-12a-9-21=0

We add all the numbers together, and all the variables

-6a-30=0

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

-6a=30

a=30/-6

a=-5