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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
28/y-6 = -10 // + 10
28/y-6+10 = 0
28*y^-1 = -4 // : 28
y^-1 = -1/7
-1 < 0
1/(y^1) = -1/7 // * y^1
1 = -1/7*y^1 // : -1/7
-7 = y^1
y = -7
y = -7
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