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z in (-oo:+oo)
(4*z)/7-2 = -8 // + 8
(4*z)/7-2+8 = 0
4/7*z+6 = 0 // - 6
4/7*z = -6 // : 4/7
z = -6/4/7
z = -21/2
z = -21/2
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