I would appreciate anyone's help in solving this problem.(1/4x^4+6/7x^3+1/8x^2+7) + (-3/4x^4+7/8x^2-7). Thank you kindly.

(1/4x^4+6/7x^3+1/8x^2+7) + (-3/4x^4+7/8x^2-7)

Just add up the "like" terms

= (-1/2)x^4 + (6/7)x^3 + x^2