Answer
$3; x \ne -3$
Work Step by Step
In order to simplify this expression, we need the same thing in the numerator and the denominator. Thus, we factor out a 3 in the numerator to obtain:
$3(x+3)/(x+3)$.
We now have the same thing, x+3, in the numerator and the denominator, so we can cancel it out, leaving us with the number 3. (Note, in the answer x cannot equal -3 as x+3 is in the denominator of the original expression, meaning that if x=-3, 0 would be in the denominator, which is not allowed.)
