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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.3/x = 18/5 // - 18/5
6.3/x-(18/5) = 0
6.3/x-18/5 = 0
6.3*x^-1 = 18/5 // : 6.3
x^-1 = 0.57142857
-1 < 0
1/(x^1) = 0.57142857 // * x^1
1 = 0.57142857*x^1 // : 0.57142857
1.75 = x^1
x = 1.75
x = 1.75
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