-42=r-13

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Solution for -42=r-13 equation: 



-42=r-13

We move all terms to the left:

-42-(r-13)=0

We get rid of parentheses

-r+13-42=0

We add all the numbers together, and all the variables

-1r-29=0

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

-r=29

r=29/-1

r=-29

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