503=r+-428

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Solution for 503=r+-428 equation: 



503=r+-428

We move all terms to the left:

503-(r+-428)=0

We add all the numbers together, and all the variables

-(r-428)+503=0

We get rid of parentheses

-r+428+503=0

We add all the numbers together, and all the variables

-1r+931=0

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

-r=-931

r=-931/-1

r=+931

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