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c+43=c+9+c
We move all terms to the left:
c+43-(c+9+c)=0
We add all the numbers together, and all the variables
c-(2c+9)+43=0
We get rid of parentheses
c-2c-9+43=0
We add all the numbers together, and all the variables
-1c+34=0
We move all terms containing c to the left, all other terms to the right
-c=-34
c=-34/-1
c=+34
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