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4c+1-5+2c = 6c-4.
6c-4c =2c
12-2c = 2c add 2c to both sides 12 = 4c divide both sides by 4 3 = c
4c2 + 5c + 2c = 4c2 + 7c = c(4c + 7)
6c-18=4c Why can rearrange this and simplify to 2c=18, which means that c = 9