If 5x - 3 ≤ 5 + 3x ≤ 4x + 2, express it as a ≤ x ≤ b and then state the values of a and b.

Solve the following inequation and graph the solution set on the number line :

2x - 3 < x + 2 ≤ 3x + 5; x ∈ R.

Solve and graph the solution set of :

2x - 9 ≤ 7 and 3x + 9 > 25; x ∈ I

Solve and graph the solution set of :

x + 5 ≥ 4(x - 1) and 3 - 2x < -7; x ∈ R.