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x in (-oo:+oo)
(1/2)*x^2+5*x = 0
1/2*x^2+5*x = 0
DELTA = 5^2-(0*1/2*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-5)/(1/2*2) or x = (-25^(1/2)-5)/(1/2*2)
x = 0 or x = -10
x in { -10, 0 }
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