Am nevoie de rasp va rog frumos

Răspuns:
X-4《7
x《11
A={11,10,9,8...-infinit}
-x+4《7
-x《3
x》-3
A={-3,-2,-1,0....+infinit}
b)-×+2=5
x=-3
B={3}
x-2=5
x=7
B={7}