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= -2a-4b+2c-3a+3b-6c
=-2a-3a-4b+3b+2c-6c
= -5a-b-4c
b.)-3(a-2b+c) - (-2(a+2b-c)
=-3a+6b-3c-(-2a-2b+c)
= -3a+6b-3c+2a+2b-c
= -3a+2a+6b+2b-3c-c
= -a+8a-4c