-k = 10 + 3x^3 - 6x - 7x^5 - x^2 - 2x^4

Is this k = 7x^5 + 2x^4 - 3x^3 + 6x - 10?

I would think this: -(7x^5 + 2x^4 - 3x^3 + 6x - 10) more than "7x^5 + 2x^4 - 3x^3 + 6x - 10".

I hope this helps! :)