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z in (-oo:+oo)
4/1 = z/20 // - z/20
4/1-(z/20) = 0
4-(z/20) = 0
4-1/20*z = 0 // - 4
-1/20*z = -4 // : -1/20
z = -4/(-1/20)
z = 80
z = 80
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