4=-2r+r

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Solution for 4=-2r+r equation: 



4=-2r+r

We move all terms to the left:

4-(-2r+r)=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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