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1. \(9x-x^2=\) [ ].
2. \(7x^2-5x=\) [ ].
3. \(\dfrac{1}{4}-x^2=\) [ ].
4. \(\dfrac{x^2}{16}-1=\) [ ].
5. \(x^3-36x=\) [ ].
6. \(49x-4x^3=\) [ ].