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z in (-oo:+oo)
z-15 = z/(-3) // - z/(-3)
z-(z/(-3))-15 = 0
4/3*z-15 = 0 // + 15
4/3*z = 15 // : 4/3
z = 15/4/3
z = 45/4
z = 45/4
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