Ответ:
-( 9+6x+x^2) +5(1-2x+x^2)
-9-6x-x^2+5-10x+5x^2
-4-16x-4x^2
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Ответ:
-( 9+6x+x^2) +5(1-2x+x^2)
-9-6x-x^2+5-10x+5x^2
-4-16x-4x^2