-10c-(-20c)=20

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Solution for -10c-(-20c)=20 equation: 



-10c-(-20c)=20

We move all terms to the left:

-10c-(-20c)-(20)=0

We get rid of parentheses

-10c+20c-20=0

We add all the numbers together, and all the variables

10c-20=0

We move all terms containing c to the left, all other terms to the right

10c=20

c=20/10

c=2

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