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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/7 = 18/y // - 18/y
6/7-(18/y) = 0
6/7-18*y^-1 = 0
-18*y^-1 = -6/7 // : -18
y^-1 = 1/21
-1 < 0
1/(y^1) = 1/21 // * y^1
1 = 1/21*y^1 // : 1/21
21 = y^1
y = 21
y = 21
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