63/81=70/x

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Solution for 63/81=70/x equation: 


D( x )

x = 0

x = 0

x = 0

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

63/81 = 70/x // - 70/x

63/81-(70/x) = 0

63/81-70*x^-1 = 0

-70*x^-1 = -7/9 // : -70

x^-1 = 1/90

-1 < 0

1/(x^1) = 1/90 // * x^1

1 = 1/90*x^1 // : 1/90

90 = x^1

x = 90

x = 90

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