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20=12c-30+6c
We move all terms to the left:
20-(12c-30+6c)=0
We add all the numbers together, and all the variables
-(18c-30)+20=0
We get rid of parentheses
-18c+30+20=0
We add all the numbers together, and all the variables
-18c+50=0
We move all terms containing c to the left, all other terms to the right
-18c=-50
c=-50/-18
c=2+7/9
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