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4(c-1)-9=9c-1
We move all terms to the left:
4(c-1)-9-(9c-1)=0
We multiply parentheses
4c-(9c-1)-4-9=0
We get rid of parentheses
4c-9c+1-4-9=0
We add all the numbers together, and all the variables
-5c-12=0
We move all terms containing c to the left, all other terms to the right
-5c=12
c=12/-5
c=-2+2/5
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