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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/7 = 21/x // - 21/x
17/7-(21/x) = 0
17/7-21*x^-1 = 0
-21*x^-1 = -17/7 // : -21
x^-1 = 17/147
-1 < 0
1/(x^1) = 17/147 // * x^1
1 = 17/147*x^1 // : 17/147
147/17 = x^1
x = 147/17
x = 147/17
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