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7+c=9.c
We move all terms to the left:
7+c-(9.c)=0
We add all the numbers together, and all the variables
c-(+9.c)+7=0
We get rid of parentheses
c-9.c+7=0
We add all the numbers together, and all the variables
-8c+7=0
We move all terms containing c to the left, all other terms to the right
-8c=-7
c=-7/-8
c=7/8
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