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z in (-oo:+oo)
14.2 = z/0.2 // - z/0.2
14.2-(z/0.2) = 0
14.2-5*z = 0
14.2-5*z = 0 // - 14.2
-5*z = -14.2 // : -5
z = -14.2/(-5)
z = 2.84
z = 2.84
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