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3c+2c+4=40-c
We move all terms to the left:
3c+2c+4-(40-c)=0
We add all the numbers together, and all the variables
3c+2c-(-1c+40)+4=0
We add all the numbers together, and all the variables
5c-(-1c+40)+4=0
We get rid of parentheses
5c+1c-40+4=0
We add all the numbers together, and all the variables
6c-36=0
We move all terms containing c to the left, all other terms to the right
6c=36
c=36/6
c=6
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