Given 20 - 5x < 5(x + 8), find the smallest value of x when :
(i) x ∈ I
(ii) x ∈ W
(iii) x ∈ N
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If x ∈ Z, solve : 2 + 4x < 2x - 5 ≤ 3x. Also, represent its solution on the real number line.
If P = {x : 7x - 4 > 5x + 2, x ∈ R} and Q = {x : x - 19 ≥ 1 - 3x, x ∈ R}; find the range of set P ∩ Q and represent it on a number line.