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-2(f-40)=-24
We move all terms to the left:
-2(f-40)-(-24)=0
We add all the numbers together, and all the variables
-2(f-40)+24=0
We multiply parentheses
-2f+80+24=0
We add all the numbers together, and all the variables
-2f+104=0
We move all terms containing f to the left, all other terms to the right
-2f=-104
f=-104/-2
f=+52
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