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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(4*(37/y))/7 = 74/35 // - 74/35
(4*(37/y))/7-(74/35) = 0
(4*(37/y))/7-74/35 = 0
148/7*y^-1 = 74/35 // : 148/7
y^-1 = 1/10
-1 < 0
1/(y^1) = 1/10 // * y^1
1 = 1/10*y^1 // : 1/10
10 = y^1
y = 10
y = 10
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