-144=-6(3+3r)

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Solution for -144=-6(3+3r) equation: 



-144=-6(3+3r)

We move all terms to the left:

-144-(-6(3+3r))=0

We add all the numbers together, and all the variables

-(-6(3r+3))-144=0



We calculate terms in parentheses: -(-6(3r+3)), so:

-6(3r+3)

We multiply parentheses

-18r-18

Back to the equation:

-(-18r-18)



We get rid of parentheses

18r+18-144=0

We add all the numbers together, and all the variables

18r-126=0

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

18r=126

r=126/18

r=7

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