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f=10-f
We move all terms to the left:
f-(10-f)=0
We add all the numbers together, and all the variables
f-(-1f+10)=0
We get rid of parentheses
f+1f-10=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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