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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
14/1.5 = 4.2/y // - 4.2/y
14/1.5-(4.2/y) = 0
14/1.5-4.2*y^-1 = 0
-4.2*y^-1 = -9.33333333 // : -4.2
y^-1 = 2.22222222
-1 < 0
1/(y^1) = 2.22222222 // * y^1
1 = 2.22222222*y^1 // : 2.22222222
0.45 = y^1
y = 0.45
y = 0.45
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