138=6+3(7a+9)

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Solution for 138=6+3(7a+9) equation: 



138=6+3(7a+9)

We move all terms to the left:

138-(6+3(7a+9))=0



We calculate terms in parentheses: -(6+3(7a+9)), so:

6+3(7a+9)

determiningTheFunctionDomain
3(7a+9)+6

We multiply parentheses

21a+27+6

We add all the numbers together, and all the variables

21a+33

Back to the equation:

-(21a+33)



We get rid of parentheses

-21a-33+138=0

We add all the numbers together, and all the variables

-21a+105=0

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

-21a=-105

a=-105/-21

a=+5

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