31=40-c

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Solution for 31=40-c equation: 



31=40-c

We move all terms to the left:

31-(40-c)=0

We add all the numbers together, and all the variables

-(-1c+40)+31=0

We get rid of parentheses

1c-40+31=0

We add all the numbers together, and all the variables

c-9=0

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

c=9

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