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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)
((53-(5*x))/(8-x))*(1-x) = 0
((53-5*x)/(8-x))*(1-x) = 0
((53-5*x)*(1-x))/(8-x) = 0
( 1-x )
1-x = 0 // - 1
-x = -1 // * -1
x = 1
( 53-5*x )
53-5*x = 0 // - 53
-5*x = -53 // : -5
x = -53/(-5)
x = 53/5
x in { 1, 53/5 }
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