F(-3.29) = (-3.29) + 2.58
f(-3.29) = -0.71
4/5x-8=3
move -8 to the other side and add
4/5x=3+8
4/5x=11
move 5x to the other side and multiply
4=5x*11
4=55x
4/55=x
You want to isolate the variable 'y'.

Subtract 10 to both sides:

Divide -3 to both sides:
So I decided to make a visual aid for this problem.
All of the work is outlined in the image.
Your final answer is 109.
Hope that helps!