z = 4, u = 4, you can't solve it, z = 16, z = -16, , y = 40, y = 384, y = -6, y = 6, , q = -13, q = 13, q = -11, q = 12, , a = 16, a = -36, a = 36, a = 20, , r = 4, r = -21, r = 10, r = 21, , m = 15, m = 7, m = -7, m = -15, , c = 20, c = 6, c = 4/24, c = -6, c = 0, , a = 16, a = -10, a = 10, a = -16.

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