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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/8 = 4/y // - 4/y
7/8-(4/y) = 0
7/8-4*y^-1 = 0
-4*y^-1 = -7/8 // : -4
y^-1 = 7/32
-1 < 0
1/(y^1) = 7/32 // * y^1
1 = 7/32*y^1 // : 7/32
32/7 = y^1
y = 32/7
y = 32/7
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