12=3+9(x-1)

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Solution for 12=3+9(x-1) equation: 



12=3+9(x-1)

We move all terms to the left:

12-(3+9(x-1))=0



We calculate terms in parentheses: -(3+9(x-1)), so:

3+9(x-1)

determiningTheFunctionDomain
9(x-1)+3

We multiply parentheses

9x-9+3

We add all the numbers together, and all the variables

9x-6

Back to the equation:

-(9x-6)



We get rid of parentheses

-9x+6+12=0

We add all the numbers together, and all the variables

-9x+18=0

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

-9x=-18

x=-18/-9

x=+2

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