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-13=2f-5
We move all terms to the left:
-13-(2f-5)=0
We get rid of parentheses
-2f+5-13=0
We add all the numbers together, and all the variables
-2f-8=0
We move all terms containing f to the left, all other terms to the right
-2f=8
f=8/-2
f=-4
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