[tex]\large \textnormal{F=31}[/tex], is the correct answer.
[tex]\large \textnormal{First, subtract by 35 from both sides of the equation.}[/tex]
[tex]\displaystyle 35-f-35=4-35[/tex]
[tex]\large \textnormal{Solve.}[/tex]
[tex]\displaystyle -f=-31[/tex]
[tex]\large \textnormal{Then you divide by -1 from both sides of the equation.}[/tex]
[tex]\displaystyle \frac{-f}{-1}=\frac{-31}{-1}[/tex]
[tex]\large \textnormal{Solve to find the answer.}[/tex]
[tex]\displaystyle -31\div-1=31[/tex]
[tex]\large \boxed{f=31}\checkmark[/tex]
Hope this helps!
