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z in (-oo:+oo)
(3*z)/7-6 = 5 // - 5
(3*z)/7-6-5 = 0
3/7*z-11 = 0 // + 11
3/7*z = 11 // : 3/7
z = 11/3/7
z = 77/3
z = 77/3
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