100/5=40/x

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Solution for 100/5=40/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

100/5 = 40/x // - 40/x

100/5-(40/x) = 0

100/5-40*x^-1 = 0

-40*x^-1 = -20 // : -40

x^-1 = 1/2

-1 < 0

1/(x^1) = 1/2 // * x^1

1 = 1/2*x^1 // : 1/2

2 = x^1

x = 2

x = 2

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