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D( x )
x-200 = 0
x-200 = 0
x-200 = 0
x-200 = 0 // + 200
x = 200
x in (-oo:200) U (200:+oo)
x/(x-200) = 9/7 // - 9/7
x/(x-200)-(9/7) = 0
x/(x-200)-9/7 = 0
(7*x)/(7*(x-200))+(-9*(x-200))/(7*(x-200)) = 0
7*x-9*(x-200) = 0
1800-2*x = 0
(1800-2*x)/(7*(x-200)) = 0
(1800-2*x)/(7*(x-200)) = 0 // * 7*(x-200)
1800-2*x = 0
1800-2*x = 0 // - 1800
-2*x = -1800 // : -2
x = -1800/(-2)
x = 900
x = 900
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