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18-c=-9c
We move all terms to the left:
18-c-(-9c)=0
We add all the numbers together, and all the variables
-1c-(-9c)+18=0
We get rid of parentheses
-1c+9c+18=0
We add all the numbers together, and all the variables
8c+18=0
We move all terms containing c to the left, all other terms to the right
8c=-18
c=-18/8
c=-2+1/4
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