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x in (-oo:+oo)
((5*x)/2)*x = 3*x // - 3*x
((5*x)/2)*x-(3*x) = 0
((5*x)/2)*x-3*x = 0
5/2*x^2-3*x = 0
DELTA = (-3)^2-(0*5/2*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)+3)/(2*5/2) or x = (3-9^(1/2))/(2*5/2)
x = 6/5 or x = 0
x in { 0, 6/5 }
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