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84=51+11c
We move all terms to the left:
84-(51+11c)=0
We add all the numbers together, and all the variables
-(11c+51)+84=0
We get rid of parentheses
-11c-51+84=0
We add all the numbers together, and all the variables
-11c+33=0
We move all terms containing c to the left, all other terms to the right
-11c=-33
c=-33/-11
c=+3
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