100/(5-x)=20

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Solution for 100/(5-x)=20 equation: 


D( x )

5-x = 0

5-x = 0

5-x = 0

5-x = 0 // - 5

-x = -5 // * -1

x = 5

x in (-oo:5) U (5:+oo)

100/(5-x) = 20 // - 20

100/(5-x)-20 = 0

100/(5-x)+(-20*(5-x))/(5-x) = 0

100-20*(5-x) = 0

20*x = 0

(20*x)/(5-x) = 0

(20*x)/(5-x) = 0 // * 5-x

20*x = 0

20*x = 0 // : 20

x = 0

x = 0

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