-255=-7(1+6r)+4

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Solution for -255=-7(1+6r)+4 equation: 



-255=-7(1+6r)+4

We move all terms to the left:

-255-(-7(1+6r)+4)=0

We add all the numbers together, and all the variables

-(-7(6r+1)+4)-255=0



We calculate terms in parentheses: -(-7(6r+1)+4), so:

-7(6r+1)+4

We multiply parentheses

-42r-7+4

We add all the numbers together, and all the variables

-42r-3

Back to the equation:

-(-42r-3)



We get rid of parentheses

42r+3-255=0

We add all the numbers together, and all the variables

42r-252=0

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

42r=252

r=252/42

r=6

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