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-30c=-9c-3
We move all terms to the left:
-30c-(-9c-3)=0
We get rid of parentheses
-30c+9c+3=0
We add all the numbers together, and all the variables
-21c+3=0
We move all terms containing c to the left, all other terms to the right
-21c=-3
c=-3/-21
c=1/7
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