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D( x )
8-x = 0
8-x = 0
8-x = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x in (-oo:8) U (8:+oo)
(8*x+4)/(8-x) = o // - o
(8*x+4)/(8-x)-o = 0
(8*x+4)/(8-x)+(-o*(8-x))/(8-x) = 0
8*x-o*(8-x)+4 = 0
o*x-8*o+8*x+4 = 0
(o*x-8*o+8*x+4)/(8-x) = 0
(o*x-8*o+8*x+4)/(8-x) = 0 // * 8-x
o*x-8*o+8*x+4 = 0
o*x-8*o+4 = 0 // - 4-8*o
o*x = -(4-8*o) // : o
x = (-(4-8*o))/o
x = -(o^-1*(4-8*o))
x = -(o^-1*(4-8*o))
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