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