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u in (-oo:+oo)
u = 6-((5/4)*u) // - 6-((5/4)*u)
u+(5/4)*u-6 = 0
9/4*u-6 = 0 // + 6
9/4*u = 6 // : 9/4
u = 6/9/4
u = 8/3
u = 8/3
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