3(70/x)=40

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Solution for 3(70/x)=40 equation: 


D( x )

x = 0

x = 0

x = 0

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

3*(70/x) = 40 // - 40

3*(70/x)-40 = 0

210*x^-1 = 40 // : 210

x^-1 = 4/21

-1 < 0

1/(x^1) = 4/21 // * x^1

1 = 4/21*x^1 // : 4/21

21/4 = x^1

x = 21/4

x = 21/4

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