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Coordinate Geometry
Given the midpoint M of the line AB, find the missing coordinate.

1.   A(-2, 4); M(-4 1/2, 4)	2.   A(3, -2); M(4, -2)
3.   B(1, 3); M(3 1/2, 3)	4.   B(2, 7); M(2, 8 1/2)
5.   B(7, -2); M(6 1/2, -2)	6.   B(8, -18); M(4, -15 1/2)
7.   A(25, 4); M(26 1/2, -3)	8.   B(0.1, 23); M(4 3/4, 17 13/20)
9.   A(0, -13); M(-4 1/2, -10 1/2)	10.   A(4, -8); M(4, -7 1/2)
11.   B(h - 9, 6); M(-10 1/2 + h, 5)	12.   A(17.6, -6.7); M(16 11/20, -13 9/20)
13.   B(-4, 4); M(-4, 4 1/2)	14.   B(-13.4, 25.9); M(-16 9/10, 19 3/4)
15.   A(-9, j + 8); M(-11, 8 1/2 + j)	16.   B(-15, 9); M(-11 1/2, 10 1/2)
17.   B(-24.4, 0); M(-29 9/20, 7 3/5)	18.   A(n + 6, -7); M(6 1/2 + n, -6 1/2)