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-2(-c-20)=-2c-2-0
We move all terms to the left:
-2(-c-20)-(-2c-2-0)=0
We add all the numbers together, and all the variables
-2(-1c-20)-(-2c-2)=0
We multiply parentheses
2c-(-2c-2)+40=0
We get rid of parentheses
2c+2c+2+40=0
We add all the numbers together, and all the variables
4c+42=0
We move all terms containing c to the left, all other terms to the right
4c=-42
c=-42/4
c=-10+1/2
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