5/4/13/4=7/x

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Solution for 5/4/13/4=7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

((5/4)/13)/4 = 7/x // - 7/x

((5/4)/13)/4-(7/x) = 0

((5/4)/13)/4-7*x^-1 = 0

-7*x^-1 = -5/208 // : -7

x^-1 = 5/1456

-1 < 0

1/(x^1) = 5/1456 // * x^1

1 = 5/1456*x^1 // : 5/1456

1456/5 = x^1

x = 1456/5

x = 1456/5

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