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z in (-oo:+oo)
5/6 = z/4 // - z/4
5/6-(z/4) = 0
5/6-1/4*z = 0 // - 5/6
-1/4*z = -5/6 // : -1/4
z = -5/6/(-1/4)
z = 10/3
z = 10/3
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