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i in (-oo:+oo)
3-((4*i)/5)-(7*i) = 0
(-4/5)*i-7*i+3 = 0
3-39/5*i = 0 // - 3
-39/5*i = -3 // : -39/5
i = -3/(-39/5)
i = 5/13
i = 5/13
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