20-2r=8

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Solution for 20-2r=8 equation: 



20-2r=8

We move all terms to the left:

20-2r-(8)=0

We add all the numbers together, and all the variables

-2r+12=0

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

-2r=-12

r=-12/-2

r=+6

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