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4c-9=-c+11
We move all terms to the left:
4c-9-(-c+11)=0
We add all the numbers together, and all the variables
4c-(-1c+11)-9=0
We get rid of parentheses
4c+1c-11-9=0
We add all the numbers together, and all the variables
5c-20=0
We move all terms containing c to the left, all other terms to the right
5c=20
c=20/5
c=4
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