123=r+55

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Solution for 123=r+55 equation: 



123=r+55

We move all terms to the left:

123-(r+55)=0

We get rid of parentheses

-r-55+123=0

We add all the numbers together, and all the variables

-1r+68=0

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

-r=-68

r=-68/-1

r=+68

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