find the sum of (2x^2+5x-7)+(3-4x^2+6x)

To find the sum of (2x^2+5x-7)+(3-4x^2+6x), we need to combine like terms.

First, let's rearrange the terms and then combine like terms:

2x^2 - 4x^2 + 5x + 6x - 7 + 3
(2 - 4)x^2 + (5 + 6)x + (-7 + 3)
-2x^2 + 11x - 4

Therefore, the sum of (2x^2+5x-7)+(3-4x^2+6x) is -2x^2 + 11x - 4.