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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4700000/100 = 6600/x // - 6600/x
4700000/100-(6600/x) = 0
4700000/100-6600*x^-1 = 0
-6600*x^-1 = -47000 // : -6600
x^-1 = 235/33
-1 < 0
1/(x^1) = 235/33 // * x^1
1 = 235/33*x^1 // : 235/33
33/235 = x^1
x = 33/235
x = 33/235
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