r(-2)=+2-7

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Solution for r(-2)=+2-7 equation: 



r(-2)=+2-7

We move all terms to the left:

r(-2)-(+2-7)=0

We add all the numbers together, and all the variables

r(-2)-(-5)=0

We add all the numbers together, and all the variables

r(-2)+5=0

We multiply parentheses

-2r+5=0

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

-2r=-5

r=-5/-2

r=2+1/2

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