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x in (-oo:+oo)
(1/3)*x = (7/5)*x^2-(11/60) // - (7/5)*x^2-(11/60)
(1/3)*x-((7/5)*x^2)+11/60 = 0
(-7/5)*x^2+(1/3)*x+11/60 = 0
1/3*x-7/5*x^2+11/60 = 0
DELTA = (1/3)^2-(-7/5*11/60*4)
DELTA = 256/225
DELTA > 0
x = ((256/225)^(1/2)-1/3)/(-7/5*2) or x = (-(256/225)^(1/2)-1/3)/(-7/5*2)
x = -11/42 or x = 1/2
x in { -11/42, 1/2 }
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