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z in (-oo:+oo)
(3^2)/5 = (12/25)*z // - (12/25)*z
(3^2)/5-((12/25)*z) = 0
(-12/25)*z+(3^2)/5 = 0
9/5-12/25*z = 0 // - 9/5
-12/25*z = -9/5 // : -12/25
z = -9/5/(-12/25)
z = 15/4
z = 15/4
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