-105=3(-3-4r)

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Solution for -105=3(-3-4r) equation: 



-105=3(-3-4r)

We move all terms to the left:

-105-(3(-3-4r))=0

We add all the numbers together, and all the variables

-(3(-4r-3))-105=0



We calculate terms in parentheses: -(3(-4r-3)), so:

3(-4r-3)

We multiply parentheses

-12r-9

Back to the equation:

-(-12r-9)



We get rid of parentheses

12r+9-105=0

We add all the numbers together, and all the variables

12r-96=0

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

12r=96

r=96/12

r=8

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