2r-4=20

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Solution for 2r-4=20 equation: 



2r-4=20

We move all terms to the left:

2r-4-(20)=0

We add all the numbers together, and all the variables

2r-24=0

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

2r=24

r=24/2

r=12

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