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6c=7(-c+13)
We move all terms to the left:
6c-(7(-c+13))=0
We add all the numbers together, and all the variables
6c-(7(-1c+13))=0
We calculate terms in parentheses: -(7(-1c+13)), so:We get rid of parentheses
7(-1c+13)
We multiply parentheses
-7c+91
Back to the equation:
-(-7c+91)
6c+7c-91=0
We add all the numbers together, and all the variables
13c-91=0
We move all terms containing c to the left, all other terms to the right
13c=91
c=91/13
c=7
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