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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
9/5 = 27/y-7 // - 27/y-7
9/5-(27/y)+7 = 0
9/5-27*y^-1+7 = 0
-27*y^-1 = -44/5 // : -27
y^-1 = 44/135
-1 < 0
1/(y^1) = 44/135 // * y^1
1 = 44/135*y^1 // : 44/135
135/44 = y^1
y = 135/44
y = 135/44
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