Let's rewrite the question.
The quotient of a number x and -3 (x / -3) is equal to (=) 29 (29).
Now rewrite what's in parenthesis.
x / -3 = 29.
Our first priority is to get x by itself.
Since we are dividing by -3, we need to multiply by -3 to cancel out the fraction.
Remember, what you do to one side of the equation, you must do to the other side (unless you are distributing).
-3(x / -3) = x
-3(29) = -87
x = -87 is your final and simplified equation.
Your number is -87.
I hope this helps!