18=r-(-18)

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Solution for 18=r-(-18) equation: 



18=r-(-18)

We move all terms to the left:

18-(r-(-18))=0



We calculate terms in parentheses: -(r-(-18)), so:

r-(-18)

We add all the numbers together, and all the variables

r+18

Back to the equation:

-(r+18)



We get rid of parentheses

-r-18+18=0

We add all the numbers together, and all the variables

-r=0

r=0/-1

r=0

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