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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
14/y = (2/1)/7 // - (2/1)/7
14/y-((2/1)/7) = 0
14/y-2/7 = 0
14*y^-1 = 2/7 // : 14
y^-1 = 1/49
-1 < 0
1/(y^1) = 1/49 // * y^1
1 = 1/49*y^1 // : 1/49
49 = y^1
y = 49
y = 49
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