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x in (-oo:+oo)
x/12-x-(3/3) = 12 // - 12
x/12-x-(3/3)-12 = 0
x/12-x-12-1 = 0
-11/12*x-13 = 0 // + 13
-11/12*x = 13 // : -11/12
x = 13/(-11/12)
x = -156/11
x = -156/11
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