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x in (-oo:+oo)
12/11 = x/12 // - x/12
12/11-(x/12) = 0
12/11-1/12*x = 0 // - 12/11
-1/12*x = -12/11 // : -1/12
x = -12/11/(-1/12)
x = 144/11
x = 144/11
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