4=r+-1

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Solution for 4=r+-1 equation: 



4=r+-1

We move all terms to the left:

4-(r+-1)=0

We add all the numbers together, and all the variables

-(r-1)+4=0

We get rid of parentheses

-r+1+4=0

We add all the numbers together, and all the variables

-1r+5=0

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

-r=-5

r=-5/-1

r=+5

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