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-10f-20=-12f
We move all terms to the left:
-10f-20-(-12f)=0
We get rid of parentheses
-10f+12f-20=0
We add all the numbers together, and all the variables
2f-20=0
We move all terms containing f to the left, all other terms to the right
2f=20
f=20/2
f=10
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