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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.75 = 100/x // - 100/x
0.75-(100/x) = 0
0.75-100*x^-1 = 0
-100*x^-1 = -0.75 // : -100
x^-1 = 0.0075
-1 < 0
1/(x^1) = 0.0075 // * x^1
1 = 0.0075*x^1 // : 0.0075
133.33333333 = x^1
x = 133.33333333
x = 133.33333333
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