What is the best way to classify each equation?

Column A Column B

1. 5x - 20 = 2 (3x - 10) a. identity

b. contradiction

c. neither

2. 4x - 16 - 2x = 2 (x - 8)

3. 6x - 15 = 3 (2x - 6)

4. 5x - 3 (x - 4) = 2 (x - 6)

5x-20=2 (3x-10) = 6x-20, eqivalent to 5x-20=6x-20, it s a contradicion; a 2. 4x - 16 - 2x = 2 (x - 8), for this 4x - 16 - 2x = 4x-2x-16=2x-16, and 2 (x-8) = 2x-16, so 4x - 16 - 2x = 2 (x - 8) is a identity 3. For the case of 6x - 15 = 3 (2x - 6) = 6x-16, we have 6x - 15 = 6x-16 it is contradiction 4. 5x - 3 (x - 4) = 2 (x - 6), we know that 5x - 3 (x - 4) = 5x - 3x+12=2x+12, and 2 (x-6) = 2x-12, so we have 2x+12=2x-12. That is also a cotradiction, finally we have 1. B, 2. A, 3. B, 4. B