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3(1-2c)=9+7c
We move all terms to the left:
3(1-2c)-(9+7c)=0
We add all the numbers together, and all the variables
3(-2c+1)-(7c+9)=0
We multiply parentheses
-6c-(7c+9)+3=0
We get rid of parentheses
-6c-7c-9+3=0
We add all the numbers together, and all the variables
-13c-6=0
We move all terms containing c to the left, all other terms to the right
-13c=6
c=6/-13
c=-6/13
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