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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
140 = 100/x // - 100/x
140-(100/x) = 0
140-100*x^-1 = 0
-100*x^-1 = -140 // : -100
x^-1 = 7/5
-1 < 0
1/(x^1) = 7/5 // * x^1
1 = 7/5*x^1 // : 7/5
5/7 = x^1
x = 5/7
x = 5/7
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