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2(c+3)-3+9c-2c=30
We move all terms to the left:
2(c+3)-3+9c-2c-(30)=0
We add all the numbers together, and all the variables
7c+2(c+3)-33=0
We multiply parentheses
7c+2c+6-33=0
We add all the numbers together, and all the variables
9c-27=0
We move all terms containing c to the left, all other terms to the right
9c=27
c=27/9
c=3
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