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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.8/x = 1.6/100 // - 1.6/100
2.8/x-(1.6/100) = 0
2.8/x-0.016 = 0
2.8*x^-1 = 0.016 // : 2.8
x^-1 = 0.00571429
-1 < 0
1/(x^1) = 0.00571429 // * x^1
1 = 0.00571429*x^1 // : 0.00571429
174.99986875 = x^1
x = 174.99986875
x = 174.99986875
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