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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
35 = 37/y // - 37/y
35-(37/y) = 0
35-37*y^-1 = 0
-37*y^-1 = -35 // : -37
y^-1 = 35/37
-1 < 0
1/(y^1) = 35/37 // * y^1
1 = 35/37*y^1 // : 35/37
37/35 = y^1
y = 37/35
y = 37/35
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