subtract the of 2a+3b,a-2b+c and 4a+3b-6 from 7a-5b+8
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7a-5b+8a-(2a+3b+a-2b+c+4a+3b-6)
7a-5b+8a-2a-3b-a+2b-c-4a-3b+6
-9b-c+6
6-9b-c
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