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z in (-oo:+oo)
4 = z/7.9 // - z/7.9
4-(z/7.9) = 0
4-0.12658228*z = 0
4-0.12658228*z = 0 // - 4
-0.12658228*z = -4 // : -0.12658228
z = -4/(-0.12658228)
z = 31.59999962
z = 31.59999962
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