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i in (-oo:+oo)
8-((3*i)/7)-(2*i) = 0
(-3/7)*i-2*i+8 = 0
8-17/7*i = 0 // - 8
-17/7*i = -8 // : -17/7
i = -8/(-17/7)
i = 56/17
i = 56/17
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