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2/5+f=1/5
We move all terms to the left:
2/5+f-(1/5)=0
We add all the numbers together, and all the variables
f+2/5-(+1/5)=0
We get rid of parentheses
f+2/5-1/5=0
We multiply all the terms by the denominator
f*5+2-1=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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