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z in (-oo:+oo)
-11-2 = (-1/2)*z-((1/4)*z)-((7/8)*z) // - (-1/2)*z-((1/4)*z)-((7/8)*z)
(1/4)*z-((-1/2)*z)+(7/8)*z-11-2 = 0
(1/2)*z+(1/4)*z+(7/8)*z-11-2 = 0
13/8*z-13 = 0 // + 13
13/8*z = 13 // : 13/8
z = 13/13/8
z = 8
z = 8
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