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42=6(c-84)
We move all terms to the left:
42-(6(c-84))=0
We calculate terms in parentheses: -(6(c-84)), so:We get rid of parentheses
6(c-84)
We multiply parentheses
6c-504
Back to the equation:
-(6c-504)
-6c+504+42=0
We add all the numbers together, and all the variables
-6c+546=0
We move all terms containing c to the left, all other terms to the right
-6c=-546
c=-546/-6
c=+91
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