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z in (-oo:+oo)
(4*z)/7-6 = 9 // - 9
(4*z)/7-9-6 = 0
4/7*z-15 = 0 // + 15
4/7*z = 15 // : 4/7
z = 15/4/7
z = 105/4
z = 105/4
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