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10=13-f
We move all terms to the left:
10-(13-f)=0
We add all the numbers together, and all the variables
-(-1f+13)+10=0
We get rid of parentheses
1f-13+10=0
We add all the numbers together, and all the variables
f-3=0
We move all terms containing f to the left, all other terms to the right
f=3
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