-168-6r=18r-39(r+12)

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Solution for -168-6r=18r-39(r+12) equation: 



-168-6r=18r-39(r+12)

We move all terms to the left:

-168-6r-(18r-39(r+12))=0



We calculate terms in parentheses: -(18r-39(r+12)), so:

18r-39(r+12)

We multiply parentheses

18r-39r-468

We add all the numbers together, and all the variables

-21r-468

Back to the equation:

-(-21r-468)



We get rid of parentheses

-6r+21r+468-168=0

We add all the numbers together, and all the variables

15r+300=0

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

15r=-300

r=-300/15

r=-20

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