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z in (-oo:+oo)
6 = z/4.5 // - z/4.5
6-(z/4.5) = 0
6-0.22222222*z = 0
6-0.22222222*z = 0 // - 6
-0.22222222*z = -6 // : -0.22222222
z = -6/(-0.22222222)
z = 27.00000027
z = 27.00000027
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