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x in (-oo:+oo)
1/2-6*x = -1 // + 1
1/2-6*x+1 = 0
3/2-6*x = 0 // - 3/2
-6*x = -3/2 // : -6
x = -3/2/(-6)
x = 1/4
x = 1/4
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