129=-6r-7(2r-7)

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Solution for 129=-6r-7(2r-7) equation: 



129=-6r-7(2r-7)

We move all terms to the left:

129-(-6r-7(2r-7))=0



We calculate terms in parentheses: -(-6r-7(2r-7)), so:

-6r-7(2r-7)

We multiply parentheses

-6r-14r+49

We add all the numbers together, and all the variables

-20r+49

Back to the equation:

-(-20r+49)



We get rid of parentheses

20r-49+129=0

We add all the numbers together, and all the variables

20r+80=0

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

20r=-80

r=-80/20

r=-4

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