8r+7-1=20

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Solution for 8r+7-1=20 equation: 



8r+7-1=20

We move all terms to the left:

8r+7-1-(20)=0

We add all the numbers together, and all the variables

8r-14=0

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

8r=14

r=14/8

r=1+3/4

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