2x+3 apartine D6
D6 = {-6,-3,-2,-1,1,2,3,6}
2x+3 = -6 => x=-9/2 nu apartine Z
2x+3 = -3 => x=-3 apartine Z
2x+3 = -2 => x=-5/2 nu apartine Z
2x+3 = -1 => x=-2 apartine Z
2x+3 = 1 => x=-1 nu apartine Z
2x+3 = 2 => x=-1/2 nu apartine Z
2x+3 = 3 => x=0 apartine Z
2x+3 = 6 => x=3/2 nu apartine Z