Answer:
I did this before! heres what i did: 13=2f+5
We simplify the equation to the form, which is simple to understand
13=2f+5
We move all terms containing f to the left and all other terms to the right.
-2f=+5-13
We simplify left and right side of the equation.
-2f=-8
We divide both sides of the equation by -02 to get f.
f=4