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i in (-oo:+oo)
7-((3*i)/5)-(3*i) = 0
(-3/5)*i-3*i+7 = 0
7-18/5*i = 0 // - 7
-18/5*i = -7 // : -18/5
i = -7/(-18/5)
i = 35/18
i = 35/18
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