(-10×2+9)+(8×2-5x+7)

Remove parentheses.

-10×2+9+8×2-5x+7

Add -10×2 and 8×2.

-2×2+9-5x+7

Add 9 and 7.

-2×2-5x+16

Add (-10x^2+9)+(8x^2-5x+7)

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# Add (-10x^2+9)+(8x^2-5x+7)

(-10×2+9)+(8×2-5x+7)

Remove parentheses.

-10×2+9+8×2-5x+7

Add -10×2 and 8×2.

-2×2+9-5x+7

Add 9 and 7.

-2×2-5x+16

Add (-10x^2+9)+(8x^2-5x+7)