the Answer is 696969696969696969696969696
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2(5c + 2d)(5c + 2d)
The like terms are sums of b terms and c terms separately 5c+2c+3c+4b 5c +2c + 4b + 3c => 10c + 4b
You can't tell a thing about -5c+9 until you know what 'c' is. And every time 'c' changes, -5c+9 changes.
9
5 and 7 are two coefficient. And that is all. There is no third coefficient.