-1-2r=-(-7+r)

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Solution for -1-2r=-(-7+r) equation: 



-1-2r=-(-7+r)

We move all terms to the left:

-1-2r-(-(-7+r))=0

We add all the numbers together, and all the variables

-2r-(-(r-7))-1=0



We calculate terms in parentheses: -(-(r-7)), so:

-(r-7)

We get rid of parentheses

-r+7

We add all the numbers together, and all the variables

-1r+7

Back to the equation:

-(-1r+7)



We get rid of parentheses

-2r+1r-7-1=0

We add all the numbers together, and all the variables

-1r-8=0

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

-r=8

r=8/-1

r=-8

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