(3×2-10x+4)+(10×2-5x+8)

Remove parentheses.

3×2-10x+4+10×2-5x+8

Add 3×2 and 10×2.

13×2-10x+4-5x+8

Subtract 5x from -10x.

13×2-15x+4+8

Add 4 and 8.

13×2-15x+12

Add (3x^2-10x+4)+(10x^2-5x+8)

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# Add (3x^2-10x+4)+(10x^2-5x+8)

(3×2-10x+4)+(10×2-5x+8)

Remove parentheses.

3×2-10x+4+10×2-5x+8

Add 3×2 and 10×2.

13×2-10x+4-5x+8

Subtract 5x from -10x.

13×2-15x+4+8

Add 4 and 8.

13×2-15x+12

Add (3x^2-10x+4)+(10x^2-5x+8)