55.4=(x)/(3.9-x)

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Solution for 55.4=(x)/(3.9-x) equation: 


D( x )

3.9-x = 0

3.9-x = 0

3.9-x = 0

3.9-x = 0 // - 3.9

-x = -3.9 // * -1

x = 3.9

x in (-oo:3.9) U (3.9:+oo)

55.4 = x/(3.9-x) // - x/(3.9-x)

55.4-(x/(3.9-x)) = 0

(-1*x)/(3.9-x)+55.4 = 0

(-1*x)/(3.9-x)+(55.4*(3.9-x))/(3.9-x) = 0

55.4*(3.9-x)-1*x = 0

216.06-56.4*x = 0

(216.06-56.4*x)/(3.9-x) = 0

(216.06-56.4*x)/(3.9-x) = 0 // * 3.9-x

216.06-56.4*x = 0

216.06-56.4*x = 0 // - 216.06

-56.4*x = -216.06 // : -56.4

x = -216.06/(-56.4)

x = 3.83085106

x = 3.83085106

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