(7×2-1)+(2×2+7)

Remove parentheses.

7×2-1+2×2+7

Add 7×2 and 2×2.

9×2-1+7

Add -1 and 7.

9×2+6

Add (7x^2-1)+(2x^2+7)

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# Add (7x^2-1)+(2x^2+7)

(7×2-1)+(2×2+7)

Remove parentheses.

7×2-1+2×2+7

Add 7×2 and 2×2.

9×2-1+7

Add -1 and 7.

9×2+6

Add (7x^2-1)+(2x^2+7)