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x in (-oo:+oo)
3/6 = 12*x // - 12*x
3/6-(12*x) = 0
3/6-12*x = 0
1/2-12*x = 0 // - 1/2
-12*x = -1/2 // : -12
x = -1/2/(-12)
x = 1/24
x = 1/24
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