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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
660/495 = 468/y // - 468/y
660/495-(468/y) = 0
660/495-468*y^-1 = 0
-468*y^-1 = -4/3 // : -468
y^-1 = 1/351
-1 < 0
1/(y^1) = 1/351 // * y^1
1 = 1/351*y^1 // : 1/351
351 = y^1
y = 351
y = 351
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