2r-4r=-20

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Solution for 2r-4r=-20 equation: 



2r-4r=-20

We move all terms to the left:

2r-4r-(-20)=0

We add all the numbers together, and all the variables

-2r+20=0

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

-2r=-20

r=-20/-2

r=+10

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