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c-20=-c
We move all terms to the left:
c-20-(-c)=0
We add all the numbers together, and all the variables
c-(-1c)-20=0
We get rid of parentheses
c+1c-20=0
We add all the numbers together, and all the variables
2c-20=0
We move all terms containing c to the left, all other terms to the right
2c=20
c=20/2
c=10
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