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-6-6c=-8c
We move all terms to the left:
-6-6c-(-8c)=0
We get rid of parentheses
-6c+8c-6=0
We add all the numbers together, and all the variables
2c-6=0
We move all terms containing c to the left, all other terms to the right
2c=6
c=6/2
c=3
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