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