108=3(-6-7r)

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Solution for 108=3(-6-7r) equation: 



108=3(-6-7r)

We move all terms to the left:

108-(3(-6-7r))=0

We add all the numbers together, and all the variables

-(3(-7r-6))+108=0



We calculate terms in parentheses: -(3(-7r-6)), so:

3(-7r-6)

We multiply parentheses

-21r-18

Back to the equation:

-(-21r-18)



We get rid of parentheses

21r+18+108=0

We add all the numbers together, and all the variables

21r+126=0

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

21r=-126

r=-126/21

r=-6

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