-5x+4=-2

When you say "substitution", that usually means that you want to plug in a particular value of x. On the other hand, one can solve this equation for x, which is done below (just in case that's what you meant):

-5x + 4 = -2

-5x = -6

x = 6/5

The answer (if wanting to solve) is

**x = 6/5**.