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For each of the following pairs of points, find the gradients of the lines passing through them:
(a) A(2, 3), B(5, 6)
(b) C(5, 10), D(12, 20)
(c) E(-5, 6), F(2, 1)
(d) G(4, 5), H(6, 5)
(e) I(8, 0), J(12, -6)