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9=2c+1
We move all terms to the left:
9-(2c+1)=0
We get rid of parentheses
-2c-1+9=0
We add all the numbers together, and all the variables
-2c+8=0
We move all terms containing c to the left, all other terms to the right
-2c=-8
c=-8/-2
c=+4
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