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-4f=3-5f
We move all terms to the left:
-4f-(3-5f)=0
We add all the numbers together, and all the variables
-4f-(-5f+3)=0
We get rid of parentheses
-4f+5f-3=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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