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i in (-oo:+oo)
4-((6*i)/4)-(3*i) = 0
(-3/2)*i-3*i+4 = 0
4-9/2*i = 0 // - 4
-9/2*i = -4 // : -9/2
i = -4/(-9/2)
i = 8/9
i = 8/9
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