81=c+31

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Solution for 81=c+31 equation: 



81=c+31

We move all terms to the left:

81-(c+31)=0

We get rid of parentheses

-c-31+81=0

We add all the numbers together, and all the variables

-1c+50=0

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

-c=-50

c=-50/-1

c=+50

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