R(x)=-x

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Solution for R(x)=-x equation: 



(R)=-R

We move all terms to the left:

(R)-(-R)=0

We add all the numbers together, and all the variables

R-(-1R)=0

We get rid of parentheses

R+1R=0

We add all the numbers together, and all the variables

2R=0

R=0/2

R=0

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