−2 and −2.5-2 \text { and }-2.5−2 and −2.5
+2 and +2.5+2 \text { and }+2.5+2 and +2.5
+4 and +6+4 \text { and }+6+4 and +6
+2 and −2+2 \text { and }-2+2 and −2