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z in (-oo:+oo)
-2/5 = z/45 // - z/45
-(z/45)-2/5 = 0
-1/45*z-2/5 = 0 // + 2/5
-1/45*z = 2/5 // : -1/45
z = 2/5/(-1/45)
z = -18
z = -18
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