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150=12c-30+6c
We move all terms to the left:
150-(12c-30+6c)=0
We add all the numbers together, and all the variables
-(18c-30)+150=0
We get rid of parentheses
-18c+30+150=0
We add all the numbers together, and all the variables
-18c+180=0
We move all terms containing c to the left, all other terms to the right
-18c=-180
c=-180/-18
c=+10
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