-5(-4)r=-100

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



-5(-4)r=-100

We move all terms to the left:

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

We add all the numbers together, and all the variables

-5(-4)r+100=0

We multiply parentheses

20r+100=0

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

20r=-100

r=-100/20

r=-5

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