va rog <3 multumesc anticipat

7/2x+1 apartine Z
Altfel zis 2x+1 apartine D7 iar D7= {-1, -7, 1,7}
2x+1 = -7=> 2x = -8=> x = -4
2x+1 = -1=> 2x = -2 => x = -1
2x+1 = 1=> 2x = 0 => x = 0
2x+1 = 7=> 2x = 6 => x = 3
Deci A ={-1, 0, 3, 4}