-2=(r-1)/2

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Solution for -2=(r-1)/2 equation: 



-2=(r-1)/2

We move all terms to the left:

-2-((r-1)/2)=0

We multiply all the terms by the denominator


-((r-1)-2*2)=0



We calculate terms in parentheses: -((r-1)-2*2), so:

(r-1)-2*2

We add all the numbers together, and all the variables

(r-1)-4

We get rid of parentheses

r-1-4

We add all the numbers together, and all the variables

r-5

Back to the equation:

-(r-5)



We get rid of parentheses

-r+5=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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