Answer
Success!
f=52

↓Steps Explained:↓

Solve for f

2f - 23 = 81

Divide each side by 2

2f
2
=
  
-23
2

Group constants

Group our constants -23 and 81.
add 23 to both sides

2f - 23 + 23 = 81 + 23

Cancel 23 on the left side:

2f = 104

Divide each side of the equation by 2

2f
2
=
  
104
2

f = 52

Final Answer

f=52
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