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D( y )
y+2 = 0
y+2 = 0
y+2 = 0
y+2 = 0 // - 2
y = -2
y in (-oo:-2) U (-2:+oo)
(10*y+10)/(y+2) = 6.67 // - 6.67
(10*y+10)/(y+2)-6.67 = 0
(10*y+10)/(y+2)+(-6.67*(y+2))/(y+2) = 0
10*y-6.67*(y+2)+10 = 0
3.33*y-3.34 = 0
(3.33*y-3.34)/(y+2) = 0
(3.33*y-3.34)/(y+2) = 0 // * y+2
3.33*y-3.34 = 0
3.33*y-3.34 = 0 // + 3.34
3.33*y = 3.34 // : 3.33
y = 3.34/3.33
y = 1.003003
y = 1.003003
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