a: \(=3x^2+3x+2x+2=\left(x+1\right)\left(3x+2\right)\)
c: \(=2x\left(2x^2+7x+3\right)\)
\(=2x\left(x+3\right)\left(2x+1\right)\)
d: \(=\left(x-y\right)\left(x-9y\right)\)
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