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D( x )
6*x = 0
11*x = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
11*x = 0
11*x = 0
11*x = 0 // : 11
x = 0
x in (-oo:0) U (0:+oo)
1/(11*x)+1/(6*x) = 1/3 // - 1/3
1/(11*x)+1/(6*x)-(1/3) = 0
1/(11*x)+1/(6*x)-1/3 = 0
17/66*x^-1 = 1/3 // : 17/66
x^-1 = 22/17
-1 < 0
1/(x^1) = 22/17 // * x^1
1 = 22/17*x^1 // : 22/17
17/22 = x^1
x = 17/22
x = 17/22
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