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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-11/y-(13/70) = 0
-11/y-13/70 = 0
-11*y^-1 = 13/70 // : -11
y^-1 = -13/770
-1 < 0
1/(y^1) = -13/770 // * y^1
1 = -13/770*y^1 // : -13/770
-770/13 = y^1
y = -770/13
y = -770/13
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