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assuming Y >= 0 and a >= 0 and z >= 0 and b >= 0, Y = -((a - z) (2 b + m (a + z)))/2, solve for z
assuming Y >= 0 and a >= 0 and z >= 0 and b >= 0, Y = -((a - z) (2 b + m (a + z)))/2, solve for z
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