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z in (-oo:+oo)
5-((3*z)/7) = 17-((3*z)/5) // - 17-((3*z)/5)
(3*z)/5-((3*z)/7)-17+5 = 0
(-3/7)*z+(3*z)/5-17+5 = 0
6/35*z-12 = 0 // + 12
6/35*z = 12 // : 6/35
z = 12/6/35
z = 70
z = 70
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