Solve for f
f=-10
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12f-20-14f=0
Subtract 14f from both sides.
-2f-20=0
Combine 12f and -14f to get -2f.
-2f=20
Add 20 to both sides. Anything plus zero gives itself.
f=\frac{20}{-2}
Divide both sides by -2.
f=-10
Divide 20 by -2 to get -10.
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