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x in (-oo:+oo)
(1/2)/3 = x/12 // - x/12
(1/2)/3-(x/12) = 0
1/6-1/12*x = 0 // - 1/6
-1/12*x = -1/6 // : -1/12
x = -1/6/(-1/12)
x = 2
x = 2
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