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z in (-oo:+oo)
4 = z/9.1 // - z/9.1
4-(z/9.1) = 0
4-0.10989011*z = 0
4-0.10989011*z = 0 // - 4
-0.10989011*z = -4 // : -0.10989011
z = -4/(-0.10989011)
z = 36.39999996
z = 36.39999996
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