(2×2+x+3)+(3×2+2x+1)

Remove parentheses.

2×2+x+3+3×2+2x+1

Add 2×2 and 3×2.

5×2+x+3+2x+1

Add x and 2x.

5×2+3x+3+1

Add 3 and 1.

5×2+3x+4

Add (2x^2+x+3)+(3x^2+2x+1)

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# Add (2x^2+x+3)+(3x^2+2x+1)

(2×2+x+3)+(3×2+2x+1)

Remove parentheses.

2×2+x+3+3×2+2x+1

Add 2×2 and 3×2.

5×2+x+3+2x+1

Add x and 2x.

5×2+3x+3+1

Add 3 and 1.

5×2+3x+4

Add (2x^2+x+3)+(3x^2+2x+1)