39/13=120/x

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Solution for 39/13=120/x equation: 


D( x )

x = 0

x = 0

x = 0

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

39/13 = 120/x // - 120/x

39/13-(120/x) = 0

39/13-120*x^-1 = 0

-120*x^-1 = -3 // : -120

x^-1 = 1/40

-1 < 0

1/(x^1) = 1/40 // * x^1

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

40 = x^1

x = 40

x = 40

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