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z in (-oo:+oo)
z/15-(34*z) = 30 // - 30
z/15-(34*z)-30 = 0
z/15-34*z-30 = 0
-509/15*z-30 = 0 // + 30
-509/15*z = 30 // : -509/15
z = 30/(-509/15)
z = -450/509
z = -450/509
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