r-4+2r=20

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



r-4+2r=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

3r-24=0

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

3r=24

r=24/3

r=8

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