(5/x)-(2/y)=7

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Solution for (5/x)-(2/y)=7 equation: 


D( x )

x = 0

x = 0

x = 0

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

5/x-(2/y) = 7 // - 7

5/x-(2/y)-7 = 0

5/x-2*y^-1-7 = 0

5*x^-1 = -(-2*y^-1-7) // : 5

x^-1 = (7-(-2*y^-1))/5

-1 < 0

1/(x^1) = (7-(-2*y^-1))/5 // * x^1

1 = x^1*((7-(-2*y^-1))/5) // : (7-(-2*y^-1))/5

5*(2*y^-1+7)^-1 = x^1

x = 5*(2*y^-1+7)^-1

x = 5*(2*y^-1+7)^-1

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