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2*x^2-((1/2)*x)-15 = 0
2*x^2+(-1/2)*x-15 = 0
2*x^2-1/2*x-15 = 0
DELTA = (-1/2)^2-(-15*2*4)
DELTA = 481/4
DELTA > 0
x = ((481/4)^(1/2)+1/2)/(2*2) or x = (1/2-(481/4)^(1/2))/(2*2)
x = ((481/4)^(1/2)+1/2)/4 or x = (1/2-(481/4)^(1/2))/4
x in { (1/2-(481/4)^(1/2))/4, ((481/4)^(1/2)+1/2)/4 }
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