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b. -6k-6k-6k = -18k
c. 3p-2p-p = 0
a. -m+8-9m-6n-7 =
-m-9m-6n+8-7 = -10m-6n+1
b. -3a-5b+2c-(-11a)+3b-c =
-3a-5b+2c+11a+3b-c =
-3a+11a-5b+3b+2c-c = 8a-2b+c