-55=31-r

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Solution for -55=31-r equation: 



-55=31-r

We move all terms to the left:

-55-(31-r)=0

We add all the numbers together, and all the variables

-(-1r+31)-55=0

We get rid of parentheses

1r-31-55=0

We add all the numbers together, and all the variables

r-86=0

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

r=86

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