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-2x^{2}-7-5
Combine 4x^{2} and -6x^{2} to get -2x^{2}.
-2x^{2}-12
Subtract 5 from -7 to get -12.
-2x^{2}-12
Multiply and combine like terms.
2\left(-x^{2}-6\right)
Factor out 2. Polynomial -x^{2}-6 is not factored since it does not have any rational roots.