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

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



33=12r-3(9-r)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

12r-3(-1r+9)

We multiply parentheses

12r+3r-27

We add all the numbers together, and all the variables

15r-27

Back to the equation:

-(15r-27)



We get rid of parentheses

-15r+27+33=0

We add all the numbers together, and all the variables

-15r+60=0

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

-15r=-60

r=-60/-15

r=+4

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