-r=r-4

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Solution for -r=r-4 equation: 



-r=r-4

We move all terms to the left:

-r-(r-4)=0

We add all the numbers together, and all the variables

-1r-(r-4)=0

We get rid of parentheses

-1r-r+4=0

We add all the numbers together, and all the variables

-2r+4=0

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

-2r=-4

r=-4/-2

r=+2

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