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-1=4-f
We move all terms to the left:
-1-(4-f)=0
We add all the numbers together, and all the variables
-(-1f+4)-1=0
We get rid of parentheses
1f-4-1=0
We add all the numbers together, and all the variables
f-5=0
We move all terms containing f to the left, all other terms to the right
f=5
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