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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/2-(7/y) = 1 // - 1
3/2-(7/y)-1 = 0
3/2-7*y^-1-1 = 0
-7*y^-1 = -1/2 // : -7
y^-1 = 1/14
-1 < 0
1/(y^1) = 1/14 // * y^1
1 = 1/14*y^1 // : 1/14
14 = y^1
y = 14
y = 14
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