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z in (-oo:+oo)
(3*z)/7-6 = 1 // - 1
(3*z)/7-6-1 = 0
3/7*z-7 = 0 // + 7
3/7*z = 7 // : 3/7
z = 7/3/7
z = 49/3
z = 49/3
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