Select all equations that have infinitely many solutions.
5x + 10 = 5x + 20
4(2x – 5) = 8x – 20
5x + 8 – x = 20 + 4x – 12
15x – (10 + 5x) = 20x – 10
5x + 10 = 5x + 20
4(2x – 5) = 8x – 20
5x + 8 – x = 20 + 4x – 12
15x – (10 + 5x) = 20x – 10