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