Can y’all help me with this

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

If 3x+8=3x+8 is it one solution or no solution

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat