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(-1/10)*x^2-(5*x) = 0
(-1/10)*x^2-5*x = 0
-1/10*x^2-5*x = 0
DELTA = (-5)^2-(-1/10*0*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+5)/(-1/10*2) or x = (5-25^(1/2))/(-1/10*2)
x = -50 or x = 0
x in { -50, 0 }
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