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5=2f-5
We move all terms to the left:
5-(2f-5)=0
We get rid of parentheses
-2f+5+5=0
We add all the numbers together, and all the variables
-2f+10=0
We move all terms containing f to the left, all other terms to the right
-2f=-10
f=-10/-2
f=+5
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