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∈ [tex] D_{-5} [/tex] = ={ -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}.