(5r)*(-2)=80

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Solution for (5r)*(-2)=80 equation: 



(5r)(-2)=80

We move all terms to the left:

(5r)(-2)-(80)=0

We multiply parentheses

-10r-80=0

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

-10r=80

r=80/-10

r=-8

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