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D( x )
14-x = 0
14-x = 0
14-x = 0
14-x = 0 // - 14
-x = -14 // * -1
x = 14
x in (-oo:14) U (14:+oo)
56/(14-x) = 100 // - 100
56/(14-x)-100 = 0
56/(14-x)+(-100*(14-x))/(14-x) = 0
56-100*(14-x) = 0
100*x-1344 = 0
(100*x-1344)/(14-x) = 0
(100*x-1344)/(14-x) = 0 // * 14-x
100*x-1344 = 0
100*x-1344 = 0 // + 1344
100*x = 1344 // : 100
x = 1344/100
x = 336/25
x = 336/25
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