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x in (-oo:+oo)
(7/12)*x^2+(5/24)*x = 0
7/12*x^2+5/24*x = 0
DELTA = (5/24)^2-(0*7/12*4)
DELTA = 25/576
DELTA > 0
x = ((25/576)^(1/2)-5/24)/(7/12*2) or x = (-(25/576)^(1/2)-5/24)/(7/12*2)
x = 0 or x = -5/14
x in { -5/14, 0 }
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