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z in (-oo:+oo)
(4*z)/7-6 = 7 // - 7
(4*z)/7-7-6 = 0
4/7*z-13 = 0 // + 13
4/7*z = 13 // : 4/7
z = 13/4/7
z = 91/4
z = 91/4
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