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20-2c=-17-c+20
We move all terms to the left:
20-2c-(-17-c+20)=0
We add all the numbers together, and all the variables
-2c-(-1c+3)+20=0
We get rid of parentheses
-2c+1c-3+20=0
We add all the numbers together, and all the variables
-1c+17=0
We move all terms containing c to the left, all other terms to the right
-c=-17
c=-17/-1
c=+17
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