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z in (-oo:+oo)
(3*z)/7-8 = 6 // - 6
(3*z)/7-8-6 = 0
3/7*z-14 = 0 // + 14
3/7*z = 14 // : 3/7
z = 14/3/7
z = 98/3
z = 98/3
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