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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
49/x+11 = 18 // - 18
49/x-18+11 = 0
49*x^-1 = 7 // : 49
x^-1 = 1/7
-1 < 0
1/(x^1) = 1/7 // * x^1
1 = 1/7*x^1 // : 1/7
7 = x^1
x = 7
x = 7
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