6=13-r

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Solution for 6=13-r equation: 



6=13-r

We move all terms to the left:

6-(13-r)=0

We add all the numbers together, and all the variables

-(-1r+13)+6=0

We get rid of parentheses

1r-13+6=0

We add all the numbers together, and all the variables

r-7=0

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

r=7

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