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z in (-oo:+oo)
(4*z)/7-9 = 5 // - 5
(4*z)/7-9-5 = 0
4/7*z-14 = 0 // + 14
4/7*z = 14 // : 4/7
z = 14/4/7
z = 49/2
z = 49/2
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