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z in (-oo:+oo)
5*z-((4/10)*z)+5 = 0
5*z+(-2/5)*z+5 = 0
23/5*z+5 = 0 // - 5
23/5*z = -5 // : 23/5
z = -5/23/5
z = -25/23
z = -25/23
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