Disagree.
b/8 = 56; multiply both sides by 8 to solve for b, and you get b = 448
All the angles are different. And It's concave.
We'll do the distribute property for both.
1/2x6x=3x
1/2x-10= -5
SO....
3x-5+ -4x +30
Which is
-x + 25 or 25-x.
Hope this helps!
The correct answer is 4x-10