2=100/(x-40)

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Solution for 2=100/(x-40) equation: 


D( x )

x-40 = 0

x-40 = 0

x-40 = 0

x-40 = 0 // + 40

x = 40

x in (-oo:40) U (40:+oo)

2 = 100/(x-40) // - 100/(x-40)

2-(100/(x-40)) = 0

2-100*(x-40)^-1 = 0

2-100/(x-40) = 0

(2*(x-40))/(x-40)-100/(x-40) = 0

2*(x-40)-100 = 0

2*x-180 = 0

(2*x-180)/(x-40) = 0

(2*x-180)/(x-40) = 0 // * x-40

2*x-180 = 0

2*x-180 = 0 // + 180

2*x = 180 // : 2

x = 180/2

x = 90

x = 90

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