Combine like terms:
(8-6)x⁸-4x⁷+9x⁶-x+(7-5)=2x⁸-4x⁷+9x⁶-x+2. Note that the terms have also been arranged in decreasing powers of x. Note also how the minus distributes the signs of the terms in the brackets.
In case you can’t read the powers the answer could be written in the same form as the question:
2x8-4x7+9x6-x+2 or 2x^8-4x^7+9x^6-x+2.