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