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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(2/x) = 5/7 // - 5/7
X-(2/x)-(5/7) = 0
X-2*x^-1-5/7 = 0
-2*x^-1 = -(X-5/7) // : -2
x^-1 = (5/7-X)/(-2)
-1 < 0
1/(x^1) = (5/7-X)/(-2) // * x^1
1 = x^1*((5/7-X)/(-2)) // : (5/7-X)/(-2)
-2*(5/7-X)^-1 = x^1
x = -2*(5/7-X)^-1
x = -2*(5/7-X)^-1
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