State true or false a. 17+15=15+(-17)
b. 64-(+64)=0
c.{(-17)+8}+20={8+(-17)}+20
d. (-54)+0=0
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State true or false a. 17+15=15+(-17)
b. 64-(+64)=0
c.{(-17)+8}+20={8+(-17)}+20
d. (-54)+0=0
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