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z in (-oo:+oo)
5-((2*z)/7) = 9-((2*z)/5) // - 9-((2*z)/5)
(2*z)/5-((2*z)/7)-9+5 = 0
(-2/7)*z+(2*z)/5-9+5 = 0
4/35*z-4 = 0 // + 4
4/35*z = 4 // : 4/35
z = 4/4/35
z = 35
z = 35
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