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D( x )
13.2-x = 0
13.2-x = 0
13.2-x = 0
13.2-x = 0 // - 13.2
-x = -13.2 // * -1
x = 13.2
x in (-oo:13.2) U (13.2:+oo)
262 = ((x+217)/(13.2-x))*(13.2-x) // - ((x+217)/(13.2-x))*(13.2-x)
262-(((x+217)/(13.2-x))*(13.2-x)) = 0
262-x-217 = 0
45-x = 0 // - 45
-x = -45 // * -1
x = 45
x = 45
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