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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100/124 = 76/x // - 76/x
100/124-(76/x) = 0
100/124-76*x^-1 = 0
-76*x^-1 = -25/31 // : -76
x^-1 = 25/2356
-1 < 0
1/(x^1) = 25/2356 // * x^1
1 = 25/2356*x^1 // : 25/2356
2356/25 = x^1
x = 2356/25
x = 2356/25
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