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x^2-(3*x)+9/4 = 0
x^2-3*x+9/4 = 0
x^2-3*x+9/4 = 0
DELTA = (-3)^2-(1*9/4*4)
DELTA = 0
x = 3/(1*2)
x = 3/2 or x = 3/2
x in { 3/2, 3/2 }
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