200=115+65+r

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Solution for 200=115+65+r equation: 



200=115+65+r

We move all terms to the left:

200-(115+65+r)=0

We add all the numbers together, and all the variables

-(r+180)+200=0

We get rid of parentheses

-r-180+200=0

We add all the numbers together, and all the variables

-1r+20=0

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

-r=-20

r=-20/-1

r=+20

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