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f-2(f+10)=12
We move all terms to the left:
f-2(f+10)-(12)=0
We multiply parentheses
f-2f-20-12=0
We add all the numbers together, and all the variables
-1f-32=0
We move all terms containing f to the left, all other terms to the right
-f=32
f=32/-1
f=-32
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