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