120=x/(3-x)

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Solution for 120=x/(3-x) equation: 


D( x )

3-x = 0

3-x = 0

3-x = 0

3-x = 0 // - 3

-x = -3 // * -1

x = 3

x in (-oo:3) U (3:+oo)

120 = x/(3-x) // - x/(3-x)

120-(x/(3-x)) = 0

(-1*x)/(3-x)+120 = 0

(-1*x)/(3-x)+(120*(3-x))/(3-x) = 0

120*(3-x)-1*x = 0

360-121*x = 0

(360-121*x)/(3-x) = 0

(360-121*x)/(3-x) = 0 // * 3-x

360-121*x = 0

360-121*x = 0 // - 360

-121*x = -360 // : -121

x = -360/(-121)

x = 360/121

x = 360/121

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