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f in (-oo:+oo)
e = ((3*f)/(-5))*f // - ((3*f)/(-5))*f
e-(((3*f)/(-5))*f) = 0
(3/5)*f^2+e = 0
3/5*f^2 = -e // : 3/5
f^2 = -5/3*e
f belongs to the empty set
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