add 4A ,3b,4a,6c,-2b
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3a+4b+7c,−5a+3b−6c and 4a−2b−4c
The sum of 3a+4b+7c,−5a+3b−6c and 4a−2b−4c is calculated as shown below
(3a+4b+7c)+(−5a+3b−6c)+(4a−2b−4c)
=3a+4a−5a+4b+3b−2b+7c−6c−4c
We get,
=2a+5b−3c
Hence, the sum of 3a+4b+7c,−5a+3b−6c and 4a−2b−4c is 3c
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