(0.8-2x)/(0.2+x)=2.5

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Solution for (0.8-2x)/(0.2+x)=2.5 equation: 


D( x )

x+0.2 = 0

x+0.2 = 0

x+0.2 = 0

x+0.2 = 0 // - 0.2

x = -0.2

x in (-oo:-0.2) U (-0.2:+oo)

(0.8-(2*x))/(x+0.2) = 2.5 // - 2.5

(0.8-(2*x))/(x+0.2)-2.5 = 0

(0.8-2*x)/(x+0.2)-2.5 = 0

(0.8-2*x)/(x+0.2)+(-2.5*(x+0.2))/(x+0.2) = 0

0.8-2.5*(x+0.2)-2*x = 0

0.3-4.5*x = 0

(0.3-4.5*x)/(x+0.2) = 0

(0.3-4.5*x)/(x+0.2) = 0 // * x+0.2

0.3-4.5*x = 0

0.3-4.5*x = 0 // - 0.3

-4.5*x = -0.3 // : -4.5

x = -0.3/(-4.5)

x = 0.06666667

x = 0.06666667

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