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x in (-oo:+oo)
7.83 = x^2*((3900*x^1000)/3)+100 // - x^2*((3900*x^1000)/3)+100
7.83-(x^2*((3900*x^1000)/3))-100 = 0
7.83-1300*x^1002-100 = 0
-1300*x^1002 = 92.17 // : -1300
x^1002 = -0.0709
x belongs to the empty set
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