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f+5=20-4f
We move all terms to the left:
f+5-(20-4f)=0
We add all the numbers together, and all the variables
f-(-4f+20)+5=0
We get rid of parentheses
f+4f-20+5=0
We add all the numbers together, and all the variables
5f-15=0
We move all terms containing f to the left, all other terms to the right
5f=15
f=15/5
f=3
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