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30-10c=-7c
We move all terms to the left:
30-10c-(-7c)=0
We get rid of parentheses
-10c+7c+30=0
We add all the numbers together, and all the variables
-3c+30=0
We move all terms containing c to the left, all other terms to the right
-3c=-30
c=-30/-3
c=+10
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