105=-5(3r-3)

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Solution for 105=-5(3r-3) equation: 



105=-5(3r-3)

We move all terms to the left:

105-(-5(3r-3))=0



We calculate terms in parentheses: -(-5(3r-3)), so:

-5(3r-3)

We multiply parentheses

-15r+15

Back to the equation:

-(-15r+15)



We get rid of parentheses

15r-15+105=0

We add all the numbers together, and all the variables

15r+90=0

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

15r=-90

r=-90/15

r=-6

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