Which equations have infinitely many solutions?
5x - 1 = 5x + 1
3x - 1 = 1 - 3x
7x - 2 = 2x - 7
4(x - 1) = 4x - 4
3x + 6 = 3(x + 2)
3(x - 4) = 4(x - 3)

4(x - 1) = 4x - 4

3x + 6 = 3(x + 2)

Step-by-step explanation:

The first equation is

We simplify to get;

This is not true, therefore this equation has no solution.

The second equation is

Combine like terms:

This has a unique solution.

The 3rd equation is

Group similar terms:

The 4th equation is :

This is always true. The equation has infinite solution.

The 5th equation is:

This also has infinite solution

The 6th equation is

It has a unique solution.

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