0.4=(x/(1+2x))

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Solution for 0.4=(x/(1+2x)) equation: 


D( x )

2*x+1 = 0

2*x+1 = 0

2*x+1 = 0

2*x+1 = 0 // - 1

2*x = -1 // : 2

x = -1/2

x in (-oo:-1/2) U (-1/2:+oo)

0.4 = x/(2*x+1) // - x/(2*x+1)

0.4-(x/(2*x+1)) = 0

(-1*x)/(2*x+1)+0.4 = 0

(-1*x)/(2*x+1)+(0.4*(2*x+1))/(2*x+1) = 0

0.4*(2*x+1)-1*x = 0

0.4-0.2*x = 0

(0.4-0.2*x)/(2*x+1) = 0

(0.4-0.2*x)/(2*x+1) = 0 // * 2*x+1

0.4-0.2*x = 0

0.4-0.2*x = 0 // - 0.4

-0.2*x = -0.4 // : -0.2

x = -0.4/(-0.2)

x = 2

x = 2

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