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