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z in (-oo:+oo)
(8/9)*(z-1) = -84 // + 84
(8/9)*(z-1)+84 = 0
8/9*(z-1)+84 = 0
8/9*(z-1)+84 = 0
8/9*z+748/9 = 0
8/9*z+748/9 = 0
8/9*z+748/9 = 0 // - 748/9
8/9*z = -748/9 // : 8/9
z = -748/9/8/9
z = -187/2
z = -187/2
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