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x in (-oo:+oo)
950*x-((950/950)*x) = 0.4 // - 0.4
950*x-((950/950)*x)-0.4 = 0
950*x-x-0.4 = 0
949*x-0.4 = 0 // + 0.4
949*x = 0.4 // : 949
x = 0.4/949
x = 0.0004215
x = 0.0004215
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