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3/5+f=4/5
We move all terms to the left:
3/5+f-(4/5)=0
We add all the numbers together, and all the variables
f+3/5-(+4/5)=0
We get rid of parentheses
f+3/5-4/5=0
We multiply all the terms by the denominator
f*5+3-4=0
We add all the numbers together, and all the variables
f*5-1=0
Wy multiply elements
5f-1=0
We move all terms containing f to the left, all other terms to the right
5f=1
f=1/5
f=1/5
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