12=4(9-2r)

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Solution for 12=4(9-2r) equation: 



12=4(9-2r)

We move all terms to the left:

12-(4(9-2r))=0

We add all the numbers together, and all the variables

-(4(-2r+9))+12=0



We calculate terms in parentheses: -(4(-2r+9)), so:

4(-2r+9)

We multiply parentheses

-8r+36

Back to the equation:

-(-8r+36)



We get rid of parentheses

8r-36+12=0

We add all the numbers together, and all the variables

8r-24=0

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

8r=24

r=24/8

r=3

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