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D( x )
77-x = 0
77-x = 0
77-x = 0
77-x = 0 // - 77
-x = -77 // * -1
x = 77
x in (-oo:77) U (77:+oo)
(x-8)/(77-x)-2 = 0
(x-8)/(77-x)+(-2*(77-x))/(77-x) = 0
x-2*(77-x)-8 = 0
3*x-162 = 0
(3*x-162)/(77-x) = 0
(3*x-162)/(77-x) = 0 // * 77-x
3*x-162 = 0
3*x-162 = 0 // + 162
3*x = 162 // : 3
x = 162/3
x = 54
x = 54
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