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x in (-oo:+oo)
1/3 = 12*x // - 12*x
1/3-(12*x) = 0
1/3-12*x = 0
1/3-12*x = 0 // - 1/3
-12*x = -1/3 // : -12
x = -1/3/(-12)
x = 1/36
x = 1/36
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