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z in (-oo:+oo)
(11/2)*z+(5/2)*z-(-1/2) = -9/2 // + -9/2
(11/2)*z+(5/2)*z-(-1/2)-(-9/2) = 0
(11/2)*z+(5/2)*z+1/2+9/2 = 0
8*z+5 = 0 // - 5
8*z = -5 // : 8
z = -5/8
z = -5/8
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