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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
49/22 = 98/x // - 98/x
49/22-(98/x) = 0
49/22-98*x^-1 = 0
-98*x^-1 = -49/22 // : -98
x^-1 = 1/44
-1 < 0
1/(x^1) = 1/44 // * x^1
1 = 1/44*x^1 // : 1/44
44 = x^1
x = 44
x = 44
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