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8-f/9=-5
We move all terms to the left:
8-f/9-(-5)=0
We add all the numbers together, and all the variables
-f/9+13=0
We multiply all the terms by the denominator
-f+13*9=0
We add all the numbers together, and all the variables
-1f+117=0
We move all terms containing f to the left, all other terms to the right
-f=-117
f=-117/-1
f=+117
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