33=12-3(9-r)

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Solution for 33=12-3(9-r) equation: 



33=12-3(9-r)

We move all terms to the left:

33-(12-3(9-r))=0

We add all the numbers together, and all the variables

-(12-3(-1r+9))+33=0



We calculate terms in parentheses: -(12-3(-1r+9)), so:

12-3(-1r+9)

determiningTheFunctionDomain
-3(-1r+9)+12

We multiply parentheses

3r-27+12

We add all the numbers together, and all the variables

3r-15

Back to the equation:

-(3r-15)



We get rid of parentheses

-3r+15+33=0

We add all the numbers together, and all the variables

-3r+48=0

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

-3r=-48

r=-48/-3

r=+16

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