20-2r=80

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Solution for 20-2r=80 equation: 



20-2r=80

We move all terms to the left:

20-2r-(80)=0

We add all the numbers together, and all the variables

-2r-60=0

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

-2r=60

r=60/-2

r=-30

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