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z in (-oo:+oo)
27/45 = z/15 // - z/15
27/45-(z/15) = 0
3/5-1/15*z = 0 // - 3/5
-1/15*z = -3/5 // : -1/15
z = -3/5/(-1/15)
z = 9
z = 9
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