25/7=21/x

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Solution for 25/7=21/x equation: 


D( x )

x = 0

x = 0

x = 0

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

25/7 = 21/x // - 21/x

25/7-(21/x) = 0

25/7-21*x^-1 = 0

-21*x^-1 = -25/7 // : -21

x^-1 = 25/147

-1 < 0

1/(x^1) = 25/147 // * x^1

1 = 25/147*x^1 // : 25/147

147/25 = x^1

x = 147/25

x = 147/25

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