Brooke solved the equation below: 6r = 72 6r − 6 = 72 − 6 r = 66 is brooke's solution correct?

Let's solve 6r = 72
6r = 72
/6     /6 <Divide by 6 to isolate the 'r'
r = 12 <Answer.

Brooke is not correct; the solution is 12. She subtracted 6 from both sides rather than divided it, this is where she errs.