0.75=x/(x+4)

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Solution for 0.75=x/(x+4) equation: 


D( x )

x+4 = 0

x+4 = 0

x+4 = 0

x+4 = 0 // - 4

x = -4

x in (-oo:-4) U (-4:+oo)

0.75 = x/(x+4) // - x/(x+4)

0.75-(x/(x+4)) = 0

(-1*x)/(x+4)+0.75 = 0

(-1*x)/(x+4)+(0.75*(x+4))/(x+4) = 0

0.75*(x+4)-1*x = 0

3-0.25*x = 0

(3-0.25*x)/(x+4) = 0

(3-0.25*x)/(x+4) = 0 // * x+4

3-0.25*x = 0

3-0.25*x = 0 // - 3

-0.25*x = -3 // : -0.25

x = -3/(-0.25)

x = 12

x = 12

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