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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x+7 = 6/x // - 6/x
4/x-(6/x)+7 = 0
4/x-6*x^-1+7 = 0
-2*x^-1 = -7 // : -2
x^-1 = 7/2
-1 < 0
1/(x^1) = 7/2 // * x^1
1 = 7/2*x^1 // : 7/2
2/7 = x^1
x = 2/7
x = 2/7
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