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D( x )
10-x = 0
10-x = 0
10-x = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x in (-oo:10) U (10:+oo)
880 = 7040/(10-x) // - 7040/(10-x)
880-(7040/(10-x)) = 0
880-7040*(10-x)^-1 = 0
880-7040/(10-x) = 0
(880*(10-x))/(10-x)-7040/(10-x) = 0
880*(10-x)-7040 = 0
1760-880*x = 0
(1760-880*x)/(10-x) = 0
(1760-880*x)/(10-x) = 0 // * 10-x
1760-880*x = 0
1760-880*x = 0 // - 1760
-880*x = -1760 // : -880
x = -1760/(-880)
x = 2
x = 2
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