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x in (-oo:+oo)
1/2-4*x = -5/6 // + -5/6
1/2-4*x-(-5/6) = 0
1/2-4*x+5/6 = 0
4/3-4*x = 0 // - 4/3
-4*x = -4/3 // : -4
x = -4/3/(-4)
x = 1/3
x = 1/3
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