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z in (-oo:+oo)
(2*z)/7-6 = 7 // - 7
(2*z)/7-7-6 = 0
2/7*z-13 = 0 // + 13
2/7*z = 13 // : 2/7
z = 13/2/7
z = 91/2
z = 91/2
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