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i in (-oo:+oo)
7-(i/5)-(2*i) = 0
7-(i/5)-2*i = 0
7-11/5*i = 0 // - 7
-11/5*i = -7 // : -11/5
i = -7/(-11/5)
i = 35/11
i = 35/11
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