3(3r-r)+3(r+1)=12

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



3(3r-r)+3(r+1)=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(+2r)+3(r+1)-12=0

We multiply parentheses

6r+3r+3-12=0

We add all the numbers together, and all the variables

9r-9=0

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

9r=9

r=9/9

r=1

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