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z in (-oo:+oo)
(-5/2)*z = (5/8)*z+2/5 // - (5/8)*z+2/5
(-5/2)*z-((5/8)*z)-(2/5) = 0
(-5/2)*z+(-5/8)*z-2/5 = 0
-25/8*z-2/5 = 0 // + 2/5
-25/8*z = 2/5 // : -25/8
z = 2/5/(-25/8)
z = -16/125
z = -16/125
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