How to find the measure of each acute angle on a right triangle. plz help!​

360 - 90 = 270

Plug in the two expressions
270 = (7x + 6) + (6x - 7) -> expand
270 = 42x^2 - 1 -> bring the one to the other side and add
271 = 42x^2 -> divide by 42
6.4 = x^2 -> find the square root
2.5 = x

Then solve both equations with x = 2.5 :^)

Hope this helped!!