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x in (-oo:+oo)
4-(((10*x)/10)*x)-5 = 1 // - 1
4-(((10*x)/10)*x)-5-1 = 0
4-x^2-5-1 = 0
-1*x^2 = 2 // : -1
x^2 = -2
x belongs to the empty set
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