21/35=6/x

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Solution for 21/35=6/x equation: 


D( x )

x = 0

x = 0

x = 0

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

21/35 = 6/x // - 6/x

21/35-(6/x) = 0

21/35-6*x^-1 = 0

-6*x^-1 = -3/5 // : -6

x^-1 = 1/10

-1 < 0

1/(x^1) = 1/10 // * x^1

1 = 1/10*x^1 // : 1/10

10 = x^1

x = 10

x = 10

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