-2x^2 - 5x - 7 - (5x^2 - 2x - 5) -- Set up the equation and distribute the negative
-2x^2 - 5x - 7 - 5x^2 + 2x + 5 -- Combine like terms
-7x^2 - 3x - 2 -- Answer!
Hope this helps!! :)
