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27-9:3=24                            5+5.3=20                              8.3+7=31                              24:4+2=8

(27-9):3=6                           (5+5).3=30                          8.(3+7)=80                          24:(4+2)=4

(32-8):4=6                           (12+8).2=40                        7.(5+5)=70                          24:(8-4)=6