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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
39/x = 49/441 // - 49/441
39/x-(49/441) = 0
39/x-1/9 = 0
39*x^-1 = 1/9 // : 39
x^-1 = 1/351
-1 < 0
1/(x^1) = 1/351 // * x^1
1 = 1/351*x^1 // : 1/351
351 = x^1
x = 351
x = 351
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