12=20+c

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Solution for 12=20+c equation: 



12=20+c

We move all terms to the left:

12-(20+c)=0

We add all the numbers together, and all the variables

-(c+20)+12=0

We get rid of parentheses

-c-20+12=0

We add all the numbers together, and all the variables

-1c-8=0

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

-c=8

c=8/-1

c=-8

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