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Anonymous
It equals 10c+2 because you have to combine like terms when you use variables. So since there is a 7c and a 3c you add those because it says plus add you end up with 10c+2 because you are still adding the 2.
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4c+2 = 3c+9 4c-3c = 9-2 c = 7
17-3= 4c+3c c=2
55
(c + 3)(c^2 - 3c + 9)
-2 plus 5 equals +3