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c-2(c-18)=3c
We move all terms to the left:
c-2(c-18)-(3c)=0
We add all the numbers together, and all the variables
-2c-2(c-18)=0
We multiply parentheses
-2c-2c+36=0
We add all the numbers together, and all the variables
-4c+36=0
We move all terms containing c to the left, all other terms to the right
-4c=-36
c=-36/-4
c=+9
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