So, AC = 2AB = 2(D-C)
a-(-3) = 2(5-a)
2(b-4) = 4-1
A, B, C, and D are four points on the same straight line. The distances between the successive points are equal. If A is (1, -3), C is (4, a), and D is (b, 5). Find the values of a and b.
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