A = {x ∈ R | x < (+4)}

B = {x ∈ R | x < (+5)}

C = {x ∈ R | x > (+5)}

D = {x ∈ R | x ≤ (-2)}

E = {x ∈ R | x ≥ (+4)}

F = {x ∈ R | (+2) < x < (+5)}

G = {x ∈ R | (-4) ≤ x < (-1)}

H = {x ∈ R | (-4) ≤ x ≤ (+5)}

I = {x ∈ R | (+2/3) ≤ x ≤ (+3/2)}