-r+2r-4=r-4

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Solution for -r+2r-4=r-4 equation: 



-r+2r-4=r-4

We move all terms to the left:

-r+2r-4-(r-4)=0

We add all the numbers together, and all the variables

r-(r-4)-4=0

We get rid of parentheses

r-r+4-4=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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