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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y+1/y+2+6 = 1 // - 1
1/y+1/y-1+2+6 = 0
2*y^-1 = -7 // : 2
y^-1 = -7/2
-1 < 0
1/(y^1) = -7/2 // * y^1
1 = -7/2*y^1 // : -7/2
-2/7 = y^1
y = -2/7
y = -2/7
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