find the sum of 3a+5b+2c,2a+3b-c and a+b+c
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= 3a+5b+2c + 2a+3b-c + a+b+c
= 3a+2a+a+5b+3b+b+2c-c+c
=6a + 9b +3c-c
=6a +9b+2c ans
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