-400=-9(4r+8)-4

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Solution for -400=-9(4r+8)-4 equation: 



-400=-9(4r+8)-4

We move all terms to the left:

-400-(-9(4r+8)-4)=0



We calculate terms in parentheses: -(-9(4r+8)-4), so:

-9(4r+8)-4

We multiply parentheses

-36r-72-4

We add all the numbers together, and all the variables

-36r-76

Back to the equation:

-(-36r-76)



We get rid of parentheses

36r+76-400=0

We add all the numbers together, and all the variables

36r-324=0

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

36r=324

r=324/36

r=9

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