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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/7 = 12.3/y // - 12.3/y
3/7-(12.3/y) = 0
3/7-12.3*y^-1 = 0
-12.3*y^-1 = -3/7 // : -12.3
y^-1 = 0.03484321
-1 < 0
1/(y^1) = 0.03484321 // * y^1
1 = 0.03484321*y^1 // : 0.03484321
28.69999636 = y^1
y = 28.69999636
y = 28.69999636
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