27=-7(r-1)+13

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Solution for 27=-7(r-1)+13 equation: 



27=-7(r-1)+13

We move all terms to the left:

27-(-7(r-1)+13)=0



We calculate terms in parentheses: -(-7(r-1)+13), so:

-7(r-1)+13

We multiply parentheses

-7r+7+13

We add all the numbers together, and all the variables

-7r+20

Back to the equation:

-(-7r+20)



We get rid of parentheses

7r-20+27=0

We add all the numbers together, and all the variables

7r+7=0

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

7r=-7

r=-7/7

r=-1

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