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x^2-(9*x)+(14/4)*x = 0
x^2-9*x+(14/4)*x = 0
x^2-11/2*x = 0
DELTA = (-11/2)^2-(0*1*4)
DELTA = 121/4
DELTA > 0
x = ((121/4)^(1/2)+11/2)/(1*2) or x = (11/2-(121/4)^(1/2))/(1*2)
x = 11/2 or x = 0
x in { 0, 11/2 }
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