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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/y = 28/52 // - 28/52
7/y-(28/52) = 0
7/y-7/13 = 0
7*y^-1 = 7/13 // : 7
y^-1 = 1/13
-1 < 0
1/(y^1) = 1/13 // * y^1
1 = 1/13*y^1 // : 1/13
13 = y^1
y = 13
y = 13
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