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i in (-oo:+oo)
(2*i)/(-3)-(5*i)+7 = 0
(2*i)/(-3)-5*i+7 = 0
7-17/3*i = 0 // - 7
-17/3*i = -7 // : -17/3
i = -7/(-17/3)
i = 21/17
i = 21/17
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