Solve for f
f=4
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8f-12=20
Combine 7f and f to get 8f.
8f=20+12
Add 12 to both sides.
8f=32
Add 20 and 12 to get 32.
f=\frac{32}{8}
Divide both sides by 8.
f=4
Divide 32 by 8 to get 4.
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