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i in (-oo:+oo)
(45*i)/12-(15*i)+12 = 0
(45*i)/12-15*i+12 = 0
12-45/4*i = 0 // - 12
-45/4*i = -12 // : -45/4
i = -12/(-45/4)
i = 16/15
i = 16/15
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