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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
(5*(3*x-8))/(3*x) = 20 // - 20
(5*(3*x-8))/(3*x)-20 = 0
(5*(3*x-8))/(3*x)+(-20*3*x)/(3*x) = 0
5*(3*x-8)-20*3*x = 0
-45*x-40 = 0
(-45*x-40)/(3*x) = 0
(-45*x-40)/(3*x) = 0 // * 3*x
-45*x-40 = 0
-45*x-40 = 0 // + 40
-45*x = 40 // : -45
x = 40/(-45)
x = -8/9
x = -8/9
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