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i in (-oo:+oo)
(3/4)*(2*i-4) = 4-(2*i) // - 4-(2*i)
(3/4)*(2*i-4)+2*i-4 = 0
3/4*(2*i-4)+2*i-4 = 0
3/4*(2*i-4)+2*i-4 = 0
7/2*i-4-3 = 0
7/2*i-7 = 0
7/2*i-7 = 0
7/2*i-7 = 0 // + 7
7/2*i = 7 // : 7/2
i = 7/7/2
i = 2
i = 2
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