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z in (-oo:+oo)
-12 = (2/5)*z // - (2/5)*z
-((2/5)*z)-12 = 0
(-2/5)*z-12 = 0
-2/5*z-12 = 0 // + 12
-2/5*z = 12 // : -2/5
z = 12/(-2/5)
z = -30
z = -30
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