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-18c=-20-20c
We move all terms to the left:
-18c-(-20-20c)=0
We add all the numbers together, and all the variables
-18c-(-20c-20)=0
We get rid of parentheses
-18c+20c+20=0
We add all the numbers together, and all the variables
2c+20=0
We move all terms containing c to the left, all other terms to the right
2c=-20
c=-20/2
c=-10
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