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2/5+c=4/5
We move all terms to the left:
2/5+c-(4/5)=0
We add all the numbers together, and all the variables
c+2/5-(+4/5)=0
We get rid of parentheses
c+2/5-4/5=0
We multiply all the terms by the denominator
c*5+2-4=0
We add all the numbers together, and all the variables
c*5-2=0
Wy multiply elements
5c-2=0
We move all terms containing c to the left, all other terms to the right
5c=2
c=2/5
c=2/5
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