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-7=f/5-9
We move all terms to the left:
-7-(f/5-9)=0
We get rid of parentheses
-f/5+9-7=0
We multiply all the terms by the denominator
-f+9*5-7*5=0
We add all the numbers together, and all the variables
-1f+10=0
We move all terms containing f to the left, all other terms to the right
-f=-10
f=-10/-1
f=+10
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