Which of the following isolates r correctly?
4r - 6 = 2(n + 3)

r = 1/2n + 3

Step-by-step explanation:

Are there answer choices to choose from?  

This is how you would isolate the r:

4r = 2n + 6 + 6 so 4r = 2n + 12

Solve for r by dividing both sides by 4  so r = 1/2n + 3

-2=2n+6

2n=2-6

2n=-4

n=-2