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-7c=9+4c
We move all terms to the left:
-7c-(9+4c)=0
We add all the numbers together, and all the variables
-7c-(4c+9)=0
We get rid of parentheses
-7c-4c-9=0
We add all the numbers together, and all the variables
-11c-9=0
We move all terms containing c to the left, all other terms to the right
-11c=9
c=9/-11
c=-9/11
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