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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/11 = 12/x+8 // - 12/x+8
6/11-(12/x)-8 = 0
6/11-12*x^-1-8 = 0
-12*x^-1 = 82/11 // : -12
x^-1 = -41/66
-1 < 0
1/(x^1) = -41/66 // * x^1
1 = -41/66*x^1 // : -41/66
-66/41 = x^1
x = -66/41
x = -66/41
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