Solve for f
f = \frac{13}{9} = 1\frac{4}{9} \approx 1.444444444
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f=\frac{5}{9}+\frac{8}{9}
Add \frac{8}{9} to both sides.
f=\frac{5+8}{9}
Since \frac{5}{9} and \frac{8}{9} have the same denominator, add them by adding their numerators.
f=\frac{13}{9}
Add 5 and 8 to get 13.
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