a) \(=\left[x^2\left(2x-3\right)-3x\left(2x-3\right)+\left(2x-3\right)\right]:\left(2x-3\right)\)
\(=\left[\left(2x-3\right)\left(x^2-3x+1\right)\right]:\left(2x-3\right)=x^2-3x+1\)
b) \(=\left[x^2\left(3x+2\right)+3x\left(3x+2\right)-4\left(3x+2\right)\right]:\left(3x+2\right)\)
\(=\left[\left(3x+2\right)\left(x^2+3x-4\right)\right]:\left(3x+2\right)=x^2+3x-4\)


