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-8f+5+13f=7f-17
We move all terms to the left:
-8f+5+13f-(7f-17)=0
We add all the numbers together, and all the variables
5f-(7f-17)+5=0
We get rid of parentheses
5f-7f+17+5=0
We add all the numbers together, and all the variables
-2f+22=0
We move all terms containing f to the left, all other terms to the right
-2f=-22
f=-22/-2
f=+11
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