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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/y+3 = 9/8 // - 9/8
7/y-(9/8)+3 = 0
7/y-9/8+3 = 0
7*y^-1 = -15/8 // : 7
y^-1 = -15/56
-1 < 0
1/(y^1) = -15/56 // * y^1
1 = -15/56*y^1 // : -15/56
-56/15 = y^1
y = -56/15
y = -56/15
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