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7. a) A

b) A

8. a) A

b) A

c) F

d) A

11.  a) x=9*4:3=36:3=12

b) x=8*7:2=56:2=26

c) x=3*8:4=24:4=6

d) x=4*9:3=36:3=12

13. a) x=7*4:2-2=28:2-2+14-2=12

b) x=6*4:3-4=24:3-4=8-4=4

c) x=6*3:2+7=18:2+7=9+7=16

d) x=9*5:3+3=45:3+3=15+3=18

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