3. Provide an example of three different integers, one of which is equal to the difference of the other two, and another is the quotient of the other two.
Answer: the numbers $2, -2, -4$.

The numbers fit because $2 = (-2) - (-4); -2 = -4 / 2$.
Remark. These numbers can be found by solving in integers one of the solutions of the system $\left\{\begin{array}{c}a=b-c \\ b=\frac{c}{a}\end{array}\right.$ or a similar one.

Criteria. Correct triplet without specifying how it was found: 7 points.