2/10=7/x

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Solution for 2/10=7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

2/10 = 7/x // - 7/x

2/10-(7/x) = 0

2/10-7*x^-1 = 0

-7*x^-1 = -1/5 // : -7

x^-1 = 1/35

-1 < 0

1/(x^1) = 1/35 // * x^1

1 = 1/35*x^1 // : 1/35

35 = x^1

x = 35

x = 35

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