3(3r+4)=r

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Solution for 3(3r+4)=r equation: 



3(3r+4)=r

We move all terms to the left:

3(3r+4)-(r)=0

We add all the numbers together, and all the variables

-1r+3(3r+4)=0

We multiply parentheses

-1r+9r+12=0

We add all the numbers together, and all the variables

8r+12=0

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

8r=-12

r=-12/8

r=-1+1/2

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