Question

A={x€ Z| x-4 supra 2

Answer 1

A={x€Z/, x-4 supra 2}
x-4|2 |•x
x-4|x-4 |•2

x-4|2x
x-4|2x-4 -->x-4|2x-(2x-4)
x-4|2x-2x+4
x-4|4

x-4€D4={1;-1;2;-2;4;-4}

x-4=1 x=5
x-4=-1 x=-1+4 x=3
x-4=2 x=6
x-4=-2 x=-2+4 x=2
x-4=4 x=8
x-4=-4 x=-4+4 x=0

x€{0;2;3;5;6;8}