-4(4-5r)=64

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Solution for -4(4-5r)=64 equation: 



-4(4-5r)=64

We move all terms to the left:

-4(4-5r)-(64)=0

We add all the numbers together, and all the variables

-4(-5r+4)-64=0

We multiply parentheses

20r-16-64=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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