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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(1/4) = 1/7 // - 1/7
2/x-(1/4)-(1/7) = 0
2/x-1/4-1/7 = 0
2*x^-1 = 11/28 // : 2
x^-1 = 11/56
-1 < 0
1/(x^1) = 11/56 // * x^1
1 = 11/56*x^1 // : 11/56
56/11 = x^1
x = 56/11
x = 56/11
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