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x in (-oo:+oo)
8/12 = x/14 // - x/14
8/12-(x/14) = 0
2/3-1/14*x = 0 // - 2/3
-1/14*x = -2/3 // : -1/14
x = -2/3/(-1/14)
x = 28/3
x = 28/3
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