4+2r=20

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Solution for 4+2r=20 equation: 



4+2r=20

We move all terms to the left:

4+2r-(20)=0

We add all the numbers together, and all the variables

2r-16=0

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

2r=16

r=16/2

r=8

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