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42+2c=8c+9
We move all terms to the left:
42+2c-(8c+9)=0
We get rid of parentheses
2c-8c-9+42=0
We add all the numbers together, and all the variables
-6c+33=0
We move all terms containing c to the left, all other terms to the right
-6c=-33
c=-33/-6
c=5+1/2
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