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9(f-97)=-57
We move all terms to the left:
9(f-97)-(-57)=0
We add all the numbers together, and all the variables
9(f-97)+57=0
We multiply parentheses
9f-873+57=0
We add all the numbers together, and all the variables
9f-816=0
We move all terms containing f to the left, all other terms to the right
9f=816
f=816/9
f=90+2/3
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