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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
98/147 = 542/y // - 542/y
98/147-(542/y) = 0
98/147-542*y^-1 = 0
-542*y^-1 = -2/3 // : -542
y^-1 = 1/813
-1 < 0
1/(y^1) = 1/813 // * y^1
1 = 1/813*y^1 // : 1/813
813 = y^1
y = 813
y = 813
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