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