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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
244/y = 7 // - 7
244/y-7 = 0
244*y^-1 = 7 // : 244
y^-1 = 7/244
-1 < 0
1/(y^1) = 7/244 // * y^1
1 = 7/244*y^1 // : 7/244
244/7 = y^1
y = 244/7
y = 244/7
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