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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
150/y+3 = 10 // - 10
150/y-10+3 = 0
150*y^-1 = 7 // : 150
y^-1 = 7/150
-1 < 0
1/(y^1) = 7/150 // * y^1
1 = 7/150*y^1 // : 7/150
150/7 = y^1
y = 150/7
y = 150/7
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