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+55=0

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

-r=-55

r=-55/-1

r=+55

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