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x in (-oo:+oo)
x^2-((7/2)*x) = 0
x^2+(-7/2)*x = 0
x^2-7/2*x = 0
DELTA = (-7/2)^2-(0*1*4)
DELTA = 49/4
DELTA > 0
x = ((49/4)^(1/2)+7/2)/(1*2) or x = (7/2-(49/4)^(1/2))/(1*2)
x = 7/2 or x = 0
x in { 0, 7/2 }
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