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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1.5/y = 2.5/7 // - 2.5/7
1.5/y-(2.5/7) = 0
1.5/y-0.35714286 = 0
1.5*y^-1 = 0.35714286 // : 1.5
y^-1 = 0.23809524
-1 < 0
1/(y^1) = 0.23809524 // * y^1
1 = 0.23809524*y^1 // : 0.23809524
4.19999997 = y^1
y = 4.19999997
y = 4.19999997
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