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i in (-oo:+oo)
11-((5*i)/2)-(4*i) = 0
(-5/2)*i-4*i+11 = 0
11-13/2*i = 0 // - 11
-13/2*i = -11 // : -13/2
i = -11/(-13/2)
i = 22/13
i = 22/13
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