(-5×2+6x+7)+(-x2+4x)

Remove parentheses.

-5×2+6x+7-x2+4x

Subtract x2 from -5×2.

-6×2+6x+7+4x

Add 6x and 4x.

-6×2+10x+7

Add (-5x^2+6x+7)+(-x^2+4x)

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# Add (-5x^2+6x+7)+(-x^2+4x)

(-5×2+6x+7)+(-x2+4x)

Remove parentheses.

-5×2+6x+7-x2+4x

Subtract x2 from -5×2.

-6×2+6x+7+4x

Add 6x and 4x.

-6×2+10x+7

Add (-5x^2+6x+7)+(-x^2+4x)