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i in (-oo:+oo)
18-((7*i)/12)-(5*i) = 0
(-7/12)*i-5*i+18 = 0
18-67/12*i = 0 // - 18
-67/12*i = -18 // : -67/12
i = -18/(-67/12)
i = 216/67
i = 216/67
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