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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7.5/x = 62 // - 62
7.5/x-62 = 0
7.5*x^-1 = 62 // : 7.5
x^-1 = 8.26666667
-1 < 0
1/(x^1) = 8.26666667 // * x^1
1 = 8.26666667*x^1 // : 8.26666667
0.12096774 = x^1
x = 0.12096774
x = 0.12096774
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