-4(-5-4r)=100

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Solution for -4(-5-4r)=100 equation: 



-4(-5-4r)=100

We move all terms to the left:

-4(-5-4r)-(100)=0

We add all the numbers together, and all the variables

-4(-4r-5)-100=0

We multiply parentheses

16r+20-100=0

We add all the numbers together, and all the variables

16r-80=0

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

16r=80

r=80/16

r=5

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