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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)
842.2 = 7580/(10-x) // - 7580/(10-x)
842.2-(7580/(10-x)) = 0
842.2-7580*(10-x)^-1 = 0
842.2-7580/(10-x) = 0
(842.2*(10-x))/(10-x)-7580/(10-x) = 0
842.2*(10-x)-7580 = 0
842-842.2*x = 0
(842-842.2*x)/(10-x) = 0
(842-842.2*x)/(10-x) = 0 // * 10-x
842-842.2*x = 0
842-842.2*x = 0 // - 842
-842.2*x = -842 // : -842.2
x = -842/(-842.2)
x = 0.99976253
x = 0.99976253
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