209=13+r

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Solution for 209=13+r equation: 



209=13+r

We move all terms to the left:

209-(13+r)=0

We add all the numbers together, and all the variables

-(r+13)+209=0

We get rid of parentheses

-r-13+209=0

We add all the numbers together, and all the variables

-1r+196=0

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

-r=-196

r=-196/-1

r=+196

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