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x in (-oo:+oo)
3/(-4) = x/(-16) // - x/(-16)
3/(-4)-(x/(-16)) = 0
1/16*x-3/4 = 0 // + 3/4
1/16*x = 3/4 // : 1/16
x = 3/4/1/16
x = 12
x = 12
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