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Plz show me and give me examples 19 20 21 and 22

Plz show me and give me examples 19 20 21 and 22
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Plz show me and give me examples 19 20 21 and 22

Plz show me and give me examples 19 20 21 and 22-example-1
User Sadegh Ghanbari
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19. 3+4=4+3
20. (3•5)•2=3•(5•2)
21. 54•1=54
22. 12(a+7)=12a+84
User Ross Allen
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