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i in (-oo:+oo)
7-((8*i)/5)-(3*i) = 0
(-8/5)*i-3*i+7 = 0
7-23/5*i = 0 // - 7
-23/5*i = -7 // : -23/5
i = -7/(-23/5)
i = 35/23
i = 35/23
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