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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
300/x = 310/x-1 // - 310/x-1
300/x-(310/x)+1 = 0
300/x-310*x^-1+1 = 0
-10*x^-1 = -1 // : -10
x^-1 = 1/10
-1 < 0
1/(x^1) = 1/10 // * x^1
1 = 1/10*x^1 // : 1/10
10 = x^1
x = 10
x = 10
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