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x in (-oo:+oo)
(0.08*x^2+2*x+900)/20 = 0
0.08*x^2+2*x+900 = 0
0.08*x^2+2*x+900 = 0
DELTA = 2^2-(0.08*4*900)
DELTA = -284
DELTA < 0
1 = 0
1/20 = 0
x belongs to the empty set
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