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