Let A (-2, -1, 0, 1, 2, 3, 4, 5, 6, 7) and define a relation R on A as follows: For all x, y EA, x Ry 31(xy). It is a fact that R is an equivalence relation on A. Use set-roster notation to write the equivalence classes of R. [0] {3,6} [1] => x [2] [3] = How many distinct equivalence classes does R have? classes List the distinct equivalence classes of R. (Enter your answer as a comma-separated list of sets.)