(x3+6x-5)+(-6×2+4x+3)

Remove parentheses.

x3+6x-5-6×2+4x+3

Add 6x and 4x.

x3+10x-5-6×2+3

Add -5 and 3.

x3+10x-6×2-2

Add (x^3+6x-5)+(-6x^2+4x+3)

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# Add (x^3+6x-5)+(-6x^2+4x+3)

(x3+6x-5)+(-6×2+4x+3)

Remove parentheses.

x3+6x-5-6×2+4x+3

Add 6x and 4x.

x3+10x-5-6×2+3

Add -5 and 3.

x3+10x-6×2-2

Add (x^3+6x-5)+(-6x^2+4x+3)