from the sum of a+2b+3c and -a-2b+3c subtract 2a+b-2c please kindly anyone answer my question
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sum of a+2b+3c, -a-2b+3c
=a - a + 2b - 2b + 3c - 3c
= 0
sum of a+2b+3c and -a-2b+3c subtract 2a+b-2c
= 0 - (2a+b-2c)
= -2a - b + 2c
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