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5f-2f+13=f+1
We move all terms to the left:
5f-2f+13-(f+1)=0
We add all the numbers together, and all the variables
3f-(f+1)+13=0
We get rid of parentheses
3f-f-1+13=0
We add all the numbers together, and all the variables
2f+12=0
We move all terms containing f to the left, all other terms to the right
2f=-12
f=-12/2
f=-6
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