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9c+9=-1+10c
We move all terms to the left:
9c+9-(-1+10c)=0
We add all the numbers together, and all the variables
9c-(10c-1)+9=0
We get rid of parentheses
9c-10c+1+9=0
We add all the numbers together, and all the variables
-1c+10=0
We move all terms containing c to the left, all other terms to the right
-c=-10
c=-10/-1
c=+10
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