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f=82f+7
We move all terms to the left:
f-(82f+7)=0
We get rid of parentheses
f-82f-7=0
We add all the numbers together, and all the variables
-81f-7=0
We move all terms containing f to the left, all other terms to the right
-81f=7
f=7/-81
f=-7/81
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