Which of the following equations has an infinite number of solutions?

Question

A. 3x - 3 = -4x
B. 2y + 4 - y = 16
C. 7x + 5 = 4x + 5 + 3x
D. 6y - 2 = 2(y - 1)

Answer 1

C.

7 x + 5 = 4 x + 5 + 3 x

7 x + 5 = 7 x + 5

This is true for every x.

All other equations have one solution.