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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/x+10/x = 5 // - 5
25/x+10/x-5 = 0
35*x^-1 = 5 // : 35
x^-1 = 1/7
-1 < 0
1/(x^1) = 1/7 // * x^1
1 = 1/7*x^1 // : 1/7
7 = x^1
x = 7
x = 7
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