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z in (-oo:+oo)
(4*z)/7-6 = -8 // + 8
(4*z)/7-6+8 = 0
4/7*z+2 = 0 // - 2
4/7*z = -2 // : 4/7
z = -2/4/7
z = -7/2
z = -7/2
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