The writing is a bit ambiguous, so I'm assuming that the equation is
Since appears as an additive term on both sides, you can simplify it, remaining with
Factor the common r:
If a multiplication equals zero, one of the factors equal zero. Since the numeric fraction is not zero, the only option is .
I don't believe this is the case, but in case the equation actually was
proceed as before to get rid of terms appearing on both sides and factor the r (except now it is at the denominator):
Again, one of the factor has to be zero, but none of the factor can equal zero, so the equation has no solutions.