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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
56/x = 35/49 // - 35/49
56/x-(35/49) = 0
56/x-5/7 = 0
56*x^-1 = 5/7 // : 56
x^-1 = 5/392
-1 < 0
1/(x^1) = 5/392 // * x^1
1 = 5/392*x^1 // : 5/392
392/5 = x^1
x = 392/5
x = 392/5
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