Solve for f
f\leq 2
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20f\leq 20+20
Add 20 to both sides.
20f\leq 40
Add 20 and 20 to get 40.
f\leq \frac{40}{20}
Divide both sides by 20. Since 20 is positive, the inequality direction remains the same.
f\leq 2
Divide 40 by 20 to get 2.
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