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z in (-oo:+oo)
(4*z)/7-1 = -6 // + 6
(4*z)/7-1+6 = 0
4/7*z+5 = 0 // - 5
4/7*z = -5 // : 4/7
z = -5/4/7
z = -35/4
z = -35/4
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