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2014-11-15T13:18:21+02:00
2x-5 | 5
2x-5 | 2x-5
----------------
2x-5 | 5+(2x-5) <=> 2x-5 | 2x
                       dar 2x-5 | 2x-5
                            ----------------
                            2x-5 | (2x-5)-2x <=> 2x-5 | -5 => 2x-5∈  D_{-5} =      ={ -5,-1,1,5}.

2x-5=-5 
2x=-5+5
2x=0 => x=0

2x-5=-1
2x=-1+5
2x=4 => x=2

2x-5=1
2x=1+5
2x=6 => x=3

2x-5=5
2x=5+5
2x=10 => x=5

Deci A={0,2,3,5}.
3 5 3