\(x^6-x^4-9x^3+9x^2\)
\(\left(x^6-x^4\right)-\left(9x^3-9x^2\right)\)
\(x^4\left(x^2-x\right)-9x\left(x^2-x\right)\)
\(\left(x^2-x\right)\left(x^4-9x\right)\)
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