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z in (-oo:+oo)
(2*z)/8 = 3*z-z-1 // - 3*z-z-1
(2*z)/8-(3*z)+z+1 = 0
(2*z)/8-3*z+z+1 = 0
1-7/4*z = 0 // - 1
-7/4*z = -1 // : -7/4
z = -1/(-7/4)
z = 4/7
z = 4/7
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