(5×2+8x-10)+(-12-x+3×2)

Remove parentheses.

5×2+8x-10-12-x+3×2

Add 5×2 and 3×2.

8×2+8x-10-12-x

Subtract x from 8x.

8×2+7x-10-12

Subtract 12 from -10.

8×2+7x-22

Add (5x^2+8x-10)+(-12-x+3x^2)

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# Add (5x^2+8x-10)+(-12-x+3x^2)

(5×2+8x-10)+(-12-x+3×2)

Remove parentheses.

5×2+8x-10-12-x+3×2

Add 5×2 and 3×2.

8×2+8x-10-12-x

Subtract x from 8x.

8×2+7x-10-12

Subtract 12 from -10.

8×2+7x-22

Add (5x^2+8x-10)+(-12-x+3x^2)