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10c-4c = 6
1st:-4c- 11- 4c=4c+12- 4c2nd:-8c- 11+ 11=21+ 113rd:-8c/-8+ 32/-8c=-4
4c+2 = 3c+9 4c-3c = 9-2 c = 7
4c-7 = 2c+11 4c-2c = 11+7 2c = 18 c = 9
8c2-26c+15 8c2-6c-20c+15 2c(4c-3)+5(-4c+3) (2c-5)(4c-3)