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z in (-oo:+oo)
6-((5/2)*z) = 10 // - 10
6-((5/2)*z)-10 = 0
(-5/2)*z-10+6 = 0
-5/2*z-4 = 0 // + 4
-5/2*z = 4 // : -5/2
z = 4/(-5/2)
z = -8/5
z = -8/5
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