−7≤x≤−3-7 \leq x \leq-3−7≤x≤−3
−5≤x≤−2-5 \leq x \leq-2−5≤x≤−2
2≤x≤52 \leq x \leq 52≤x≤5
3≤x≤73 \leq x \leq 73≤x≤7