-42=r+-621

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Solution for -42=r+-621 equation: 



-42=r+-621

We move all terms to the left:

-42-(r+-621)=0

We add all the numbers together, and all the variables

-(r-621)-42=0

We get rid of parentheses

-r+621-42=0

We add all the numbers together, and all the variables

-1r+579=0

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

-r=-579

r=-579/-1

r=+579

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