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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)
l = (24-(9*x))/(3*x) // - (24-(9*x))/(3*x)
l-((24-(9*x))/(3*x)) = 0
l-((24-9*x)/(3*x)) = 0
(-1*(24-9*x))/(3*x)+l = 0
(-1*(24-9*x))/(3*x)+(3*l*x)/(3*x) = 0
3*l*x-1*(24-9*x) = 0
3*l*x+9*x-24 = 0
3*l*x+9*x-24 = 0
3*(l*x+3*x-8) = 0
l*x-8 = 0 // + 8
l*x = 8 // : l
x = 8/l
3*(x-8*l^-1) = 0
(3*(x-8*l^-1))/(3*x) = 0
(3*(x-8*l^-1))/(3*x) = 0 // * 3*x
3*(x-8*l^-1) = 0
( 3 )
3 = 0
x belongs to the empty set
( x-8*l^-1 )
x-8*l^-1 = 0 // + -8*l^-1
x = -(-8*l^-1)
x = 8*l^-1
x = 8*l^-1
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