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18-6c=-5c
We move all terms to the left:
18-6c-(-5c)=0
We get rid of parentheses
-6c+5c+18=0
We add all the numbers together, and all the variables
-1c+18=0
We move all terms containing c to the left, all other terms to the right
-c=-18
c=-18/-1
c=+18
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