Find all x such that 5x - 4 < 2x + 5. Enter your answer using interval notation.

5x - 4 < 2x + 5.        add 4 to both sides of the equation

5x < 2x + 9              subtract 2x from both sides

3x <9                       divide both sides by 3

x < 3              Interval     (- inf, 3)