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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-37/y = 7.49 // - 7.49
-37/y-7.49 = 0
-37*y^-1 = 7.49 // : -37
y^-1 = -0.20243243
-1 < 0
1/(y^1) = -0.20243243 // * y^1
1 = -0.20243243*y^1 // : -0.20243243
-4.93991995 = y^1
y = -4.93991995
y = -4.93991995
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