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-20-13f=-12f
We move all terms to the left:
-20-13f-(-12f)=0
We get rid of parentheses
-13f+12f-20=0
We add all the numbers together, and all the variables
-1f-20=0
We move all terms containing f to the left, all other terms to the right
-f=20
f=20/-1
f=-20
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