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z in (-oo:+oo)
15/8 = (5/6)*z // - (5/6)*z
15/8-((5/6)*z) = 0
(-5/6)*z+15/8 = 0
15/8-5/6*z = 0 // - 15/8
-5/6*z = -15/8 // : -5/6
z = -15/8/(-5/6)
z = 9/4
z = 9/4
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