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12-3c=7(9-c)
We move all terms to the left:
12-3c-(7(9-c))=0
We add all the numbers together, and all the variables
-3c-(7(-1c+9))+12=0
We calculate terms in parentheses: -(7(-1c+9)), so:We get rid of parentheses
7(-1c+9)
We multiply parentheses
-7c+63
Back to the equation:
-(-7c+63)
-3c+7c-63+12=0
We add all the numbers together, and all the variables
4c-51=0
We move all terms containing c to the left, all other terms to the right
4c=51
c=51/4
c=12+3/4
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