x/0.4x=2.5x

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Solution for x/0.4x=2.5x equation: 


x in (-oo:+oo)

(x/0.4)*x = 2.5*x // - 2.5*x

(x/0.4)*x-(2.5*x) = 0

(x/0.4)*x-2.5*x = 0

2.5*x^2-2.5*x = 0

DELTA = (-2.5)^2-(0*2.5*4)

DELTA = 2.5^2

DELTA = 6.25

DELTA > 0

x = ((2.5^2)^(1/2)+2.5)/(2*2.5) or x = (2.5-(2.5^2)^(1/2))/(2*2.5)

x = 1 or x = 0

x in { 0, 1 }

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