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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((1/x)/7)/9+5 = 0
1/63*x^-1 = -5 // : 1/63
x^-1 = -315
-1 < 0
1/(x^1) = -315 // * x^1
1 = -315*x^1 // : -315
-1/315 = x^1
x = -1/315
x = -1/315
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