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z in (-oo:+oo)
4 = z/9.5 // - z/9.5
4-(z/9.5) = 0
4-0.10526316*z = 0
4-0.10526316*z = 0 // - 4
-0.10526316*z = -4 // : -0.10526316
z = -4/(-0.10526316)
z = 37.99999924
z = 37.99999924
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