r-r=4-r

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Solution for r-r=4-r equation: 



r-r=4-r

We move all terms to the left:

r-r-(4-r)=0

We add all the numbers together, and all the variables

r-r-(-1r+4)=0

We add all the numbers together, and all the variables

-(-1r+4)=0

We get rid of parentheses

1r-4=0

We add all the numbers together, and all the variables

r-4=0

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

r=4

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