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30=10c-10
We move all terms to the left:
30-(10c-10)=0
We get rid of parentheses
-10c+10+30=0
We add all the numbers together, and all the variables
-10c+40=0
We move all terms containing c to the left, all other terms to the right
-10c=-40
c=-40/-10
c=+4
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