-13=-(6+r)

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Solution for -13=-(6+r) equation: 



-13=-(6+r)

We move all terms to the left:

-13-(-(6+r))=0

We add all the numbers together, and all the variables

-(-(r+6))-13=0



We calculate terms in parentheses: -(-(r+6)), so:

-(r+6)

We get rid of parentheses

-r-6

We add all the numbers together, and all the variables

-1r-6

Back to the equation:

-(-1r-6)



We get rid of parentheses

1r+6-13=0

We add all the numbers together, and all the variables

r-7=0

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

r=7

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