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D( y )
1.2*y+8 = 0
1.2*y+8 = 0
1.2*y+8 = 0
1.2*y+8 = 0 // - 8
1.2*y = -8 // : 1.2
y = -8/1.2
y = -6.66666667
y in (-oo:-6.66666667) U (-6.66666667:+oo)
(0.5*y+4)/(1.2*y+8) = 5/3 // - 5/3
(0.5*y+4)/(1.2*y+8)-(5/3) = 0
(0.5*y+4)/(1.2*y+8)-5/3 = 0
(3*(0.5*y+4))/(3*(1.2*y+8))+(-5*(1.2*y+8))/(3*(1.2*y+8)) = 0
3*(0.5*y+4)-5*(1.2*y+8) = 0
-4.5*y-28 = 0
(-4.5*y-28)/(3*(1.2*y+8)) = 0
(-4.5*y-28)/(3*(1.2*y+8)) = 0 // * 3*(1.2*y+8)
-4.5*y-28 = 0
-4.5*y-28 = 0 // + 28
-4.5*y = 28 // : -4.5
y = 28/(-4.5)
y = -6.22222222
y = -6.22222222
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