8+7r=3r+20

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Solution for 8+7r=3r+20 equation: 



8+7r=3r+20

We move all terms to the left:

8+7r-(3r+20)=0

We get rid of parentheses

7r-3r-20+8=0

We add all the numbers together, and all the variables

4r-12=0

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

4r=12

r=12/4

r=3

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