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c-(0.1c)=1
We move all terms to the left:
c-(0.1c)-(1)=0
We add all the numbers together, and all the variables
c-(+0.1c)-1=0
We get rid of parentheses
c-0.1c-1=0
We add all the numbers together, and all the variables
0.9c-1=0
We move all terms containing c to the left, all other terms to the right
0.9c=1
c=1/0.9
c=1+0.1/0.9
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