30=9+11+c

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Solution for 30=9+11+c equation: 



30=9+11+c

We move all terms to the left:

30-(9+11+c)=0

We add all the numbers together, and all the variables

-(c+20)+30=0

We get rid of parentheses

-c-20+30=0

We add all the numbers together, and all the variables

-1c+10=0

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

-c=-10

c=-10/-1

c=+10

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