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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
520/x+265 = 285 // - 285
520/x-285+265 = 0
520*x^-1 = 20 // : 520
x^-1 = 1/26
-1 < 0
1/(x^1) = 1/26 // * x^1
1 = 1/26*x^1 // : 1/26
26 = x^1
x = 26
x = 26
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