255=-4r-7(6r+3)

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Solution for 255=-4r-7(6r+3) equation: 



255=-4r-7(6r+3)

We move all terms to the left:

255-(-4r-7(6r+3))=0



We calculate terms in parentheses: -(-4r-7(6r+3)), so:

-4r-7(6r+3)

We multiply parentheses

-4r-42r-21

We add all the numbers together, and all the variables

-46r-21

Back to the equation:

-(-46r-21)



We get rid of parentheses

46r+21+255=0

We add all the numbers together, and all the variables

46r+276=0

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

46r=-276

r=-276/46

r=-6

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