8+3r=20

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Solution for 8+3r=20 equation: 



8+3r=20

We move all terms to the left:

8+3r-(20)=0

We add all the numbers together, and all the variables

3r-12=0

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

3r=12

r=12/3

r=4

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