r(-3)=(-3)^3-2(-3)^2+9(-3)-1

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Solution for r(-3)=(-3)^3-2(-3)^2+9(-3)-1 equation: 



r(-3)=(-3)^3-2(-3)^2+9(-3)-1

We move all terms to the left:

r(-3)-((-3)^3-2(-3)^2+9(-3)-1)=0

We add all the numbers together, and all the variables

r(-3)+73=0

We multiply parentheses

-3r+73=0

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

-3r=-73

r=-73/-3

r=24+1/3

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