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x in (-oo:+oo)
(0.5/2)*x = -1/3 // + -1/3
(0.5/2)*x-(-1/3) = 0
(0.5/2)*x+1/3 = 0
0.25*x+1/3 = 0 // - 1/3
0.25*x = -1/3 // : 0.25
x = -1/3/0.25
x = -1.33333332
x = -1.33333332
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