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i in (-oo:+oo)
(9*i)/8+4*i+6 = 8-((4*i)/8)-(4*i) // - 8-((4*i)/8)-(4*i)
(9*i)/8+4*i+(4*i)/8+4*i-8+6 = 0
77/8*i-2 = 0 // + 2
77/8*i = 2 // : 77/8
i = 2/77/8
i = 16/77
i = 16/77
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