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-9(1-5c)=-(-9c+9)
We move all terms to the left:
-9(1-5c)-(-(-9c+9))=0
We add all the numbers together, and all the variables
-9(-5c+1)-(-(-9c+9))=0
We multiply parentheses
45c-(-(-9c+9))-9=0
We calculate terms in parentheses: -(-(-9c+9)), so:We get rid of parentheses
-(-9c+9)
We get rid of parentheses
9c-9
Back to the equation:
-(9c-9)
45c-9c+9-9=0
We add all the numbers together, and all the variables
36c=0
c=0/36
c=0
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