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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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