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-12c-(-14c)+3c+5c=20
We move all terms to the left:
-12c-(-14c)+3c+5c-(20)=0
We add all the numbers together, and all the variables
-4c-(-14c)-20=0
We get rid of parentheses
-4c+14c-20=0
We add all the numbers together, and all the variables
10c-20=0
We move all terms containing c to the left, all other terms to the right
10c=20
c=20/10
c=2
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