-5x2/5=x

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Solution for -5x2/5=x equation: 


x in (-oo:+oo)

(-5*x^2)/5 = x // - x

(-5*x^2)/5-x = 0

-x^2-x = 0

DELTA = (-1)^2-(-1*0*4)

DELTA = 1

DELTA > 0

x = (1^(1/2)+1)/(-1*2) or x = (1-1^(1/2))/(-1*2)

x = -1 or x = 0

x in { -1, 0 }

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