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i in (-oo:+oo)
9-((9*i)/5)-(8*i) = 0
(-9/5)*i-8*i+9 = 0
9-49/5*i = 0 // - 9
-49/5*i = -9 // : -49/5
i = -9/(-49/5)
i = 45/49
i = 45/49
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