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x in (-oo:+oo)
((14*x)/6)*x+(14/5)*x = 0
7/3*x^2+14/5*x = 0
DELTA = (14/5)^2-(0*7/3*4)
DELTA = 196/25
DELTA > 0
x = ((196/25)^(1/2)-14/5)/(2*7/3) or x = (-(196/25)^(1/2)-14/5)/(2*7/3)
x = 0 or x = -6/5
x in { -6/5, 0 }
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