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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
14.2/29 = 7.1/y // - 7.1/y
14.2/29-(7.1/y) = 0
14.2/29-7.1*y^-1 = 0
-7.1*y^-1 = -0.48965517 // : -7.1
y^-1 = 0.06896552
-1 < 0
1/(y^1) = 0.06896552 // * y^1
1 = 0.06896552*y^1 // : 0.06896552
14.49999942 = y^1
y = 14.49999942
y = 14.49999942
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