-91=6r-(-9r+1)

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Solution for -91=6r-(-9r+1) equation: 



-91=6r-(-9r+1)

We move all terms to the left:

-91-(6r-(-9r+1))=0



We calculate terms in parentheses: -(6r-(-9r+1)), so:

6r-(-9r+1)

We get rid of parentheses

6r+9r-1

We add all the numbers together, and all the variables

15r-1

Back to the equation:

-(15r-1)



We get rid of parentheses

-15r+1-91=0

We add all the numbers together, and all the variables

-15r-90=0

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

-15r=90

r=90/-15

r=-6

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