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i in (-oo:+oo)
5-(2*i)-((3*i)/2) = 0
(-3/2)*i-2*i+5 = 0
5-7/2*i = 0 // - 5
-7/2*i = -5 // : -7/2
i = -5/(-7/2)
i = 10/7
i = 10/7
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