120=3+3(7a-3)

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Solution for 120=3+3(7a-3) equation: 



120=3+3(7a-3)

We move all terms to the left:

120-(3+3(7a-3))=0



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

3+3(7a-3)

determiningTheFunctionDomain
3(7a-3)+3

We multiply parentheses

21a-9+3

We add all the numbers together, and all the variables

21a-6

Back to the equation:

-(21a-6)



We get rid of parentheses

-21a+6+120=0

We add all the numbers together, and all the variables

-21a+126=0

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

-21a=-126

a=-126/-21

a=+6

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