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2*x^2+10*x-((25/4)*x)+28 = 0
2*x^2+10*x+(-25/4)*x+28 = 0
2*x^2+15/4*x+28 = 0
DELTA = (15/4)^2-(2*4*28)
DELTA = -3359/16
DELTA < 0
x belongs to the empty set
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