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D( x )
6*x = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
x in (-oo:0) U (0:+oo)
0.1/(6*x) = 4/3 // - 4/3
0.1/(6*x)-(4/3) = 0
0.1/(6*x)-4/3 = 0
0.01666667*x^-1 = 4/3 // : 0.01666667
x^-1 = 79.9999838
-1 < 0
1/(x^1) = 79.9999838 // * x^1
1 = 79.9999838*x^1 // : 79.9999838
0.0125 = x^1
x = 0.0125
x = 0.0125
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