21=4+3(a-7)

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Solution for 21=4+3(a-7) equation: 



21=4+3(a-7)

We move all terms to the left:

21-(4+3(a-7))=0



We calculate terms in parentheses: -(4+3(a-7)), so:

4+3(a-7)

determiningTheFunctionDomain
3(a-7)+4

We multiply parentheses

3a-21+4

We add all the numbers together, and all the variables

3a-17

Back to the equation:

-(3a-17)



We get rid of parentheses

-3a+17+21=0

We add all the numbers together, and all the variables

-3a+38=0

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

-3a=-38

a=-38/-3

a=12+2/3

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