The sum 6a+4b-c+3,2b-3c+4,2c-5a-6 and 11b-7a+2c-1
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=6a-5a-7a+4b+2b+11b-c-3c+2c+2c+3+4-6-1
=6a-12a+17b-4c+4c+7-7
=-6a+17b ans
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