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30=10c-5c
We move all terms to the left:
30-(10c-5c)=0
We add all the numbers together, and all the variables
-(+5c)+30=0
We get rid of parentheses
-5c+30=0
We move all terms containing c to the left, all other terms to the right
-5c=-30
c=-30/-5
c=+6
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