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27 = 27
b. 135+235+75+15=15+75+235+135
460 = 460
c. (6+(-7))+7=6+((-7)+7)
6-7+7 =6-7+7
-1+7 =-1+7
6 = 6
d. (17+(28+(-7))=(17+28)+(-7)
17+28-7 =17+28-7
45-7 =45-7
38 = 38