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z in (-oo:+oo)
(5/6)*z = 3-((11/12)*z) // - 3-((11/12)*z)
(5/6)*z+(11/12)*z-3 = 0
7/4*z-3 = 0 // + 3
7/4*z = 3 // : 7/4
z = 3/7/4
z = 12/7
z = 12/7
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