-50=9r+13

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Solution for -50=9r+13 equation: 



-50=9r+13

We move all terms to the left:

-50-(9r+13)=0

We get rid of parentheses

-9r-13-50=0

We add all the numbers together, and all the variables

-9r-63=0

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

-9r=63

r=63/-9

r=-7

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