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z in (-oo:+oo)
6 = z/5.9 // - z/5.9
6-(z/5.9) = 0
6-0.16949153*z = 0
6-0.16949153*z = 0 // - 6
-0.16949153*z = -6 // : -0.16949153
z = -6/(-0.16949153)
z = 35.39999904
z = 35.39999904
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