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91=10c+1
We move all terms to the left:
91-(10c+1)=0
We get rid of parentheses
-10c-1+91=0
We add all the numbers together, and all the variables
-10c+90=0
We move all terms containing c to the left, all other terms to the right
-10c=-90
c=-90/-10
c=+9
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