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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
168 = 124/x // - 124/x
168-(124/x) = 0
168-124*x^-1 = 0
-124*x^-1 = -168 // : -124
x^-1 = 42/31
-1 < 0
1/(x^1) = 42/31 // * x^1
1 = 42/31*x^1 // : 42/31
31/42 = x^1
x = 31/42
x = 31/42
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