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82=74.6+c
We move all terms to the left:
82-(74.6+c)=0
We add all the numbers together, and all the variables
-(c+74.6)+82=0
We get rid of parentheses
-c-74.6+82=0
We add all the numbers together, and all the variables
-1c+7.4=0
We move all terms containing c to the left, all other terms to the right
-c=-7.4
c=-7.4/-1
c=7+0.4/1
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