(-7,-1)r=16

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Solution for (-7,-1)r=16 equation: 



(-7.-1)r=16

We move all terms to the left:

(-7.-1)r-(16)=0

We add all the numbers together, and all the variables

(-8)r-16=0

We multiply parentheses

-8r-16=0

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

-8r=16

r=16/-8

r=-2

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