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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
61875/x = 630 // - 630
61875/x-630 = 0
61875*x^-1 = 630 // : 61875
x^-1 = 14/1375
-1 < 0
1/(x^1) = 14/1375 // * x^1
1 = 14/1375*x^1 // : 14/1375
1375/14 = x^1
x = 1375/14
x = 1375/14
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