Solve for f
f = \frac{20}{3} = 6\frac{2}{3} \approx 6.666666667
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30=3f+3\times 3+1
Multiply both sides of the equation by 3.
30=3f+9+1
Multiply 3 and 3 to get 9.
30=3f+10
Add 9 and 1 to get 10.
3f+10=30
Swap sides so that all variable terms are on the left hand side.
3f=30-10
Subtract 10 from both sides.
3f=20
Subtract 10 from 30 to get 20.
f=\frac{20}{3}
Divide both sides by 3.
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