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6f+9=13f-5
We move all terms to the left:
6f+9-(13f-5)=0
We get rid of parentheses
6f-13f+5+9=0
We add all the numbers together, and all the variables
-7f+14=0
We move all terms containing f to the left, all other terms to the right
-7f=-14
f=-14/-7
f=+2
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