(9×2-8)+(9×2+9x+3)

Remove parentheses.

9×2-8+9×2+9x+3

Add 9×2 and 9×2.

18×2-8+9x+3

Add -8 and 3.

18×2+9x-5

Add (9x^2-8)+(9x^2+9x+3)

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# Add (9x^2-8)+(9x^2+9x+3)

(9×2-8)+(9×2+9x+3)

Remove parentheses.

9×2-8+9×2+9x+3

Add 9×2 and 9×2.

18×2-8+9x+3

Add -8 and 3.

18×2+9x-5

Add (9x^2-8)+(9x^2+9x+3)