How do you work out 4x -6 over 7 equals 2?

Multiply both sides by 7.

4x - 6 = 14

Add 6 to both sides.

4x = 20

Divide both sides by 4.

x = 5

Check it.

(20 - 6) divided by 7 = 2

14/7 = 2

It checks.