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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
21/x+6 = 7/6 // - 7/6
21/x-(7/6)+6 = 0
21/x-7/6+6 = 0
21*x^-1 = -29/6 // : 21
x^-1 = -29/126
-1 < 0
1/(x^1) = -29/126 // * x^1
1 = -29/126*x^1 // : -29/126
-126/29 = x^1
x = -126/29
x = -126/29
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