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