1=3+-2r

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Solution for 1=3+-2r equation: 



1=3+-2r

We move all terms to the left:

1-(3+-2r)=0

We add all the numbers together, and all the variables

-(-2r)+1=0

We get rid of parentheses

2r+1=0

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

2r=-1

r=-1/2

r=-1/2

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