15r-20=1+8r

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Solution for 15r-20=1+8r equation: 



15r-20=1+8r

We move all terms to the left:

15r-20-(1+8r)=0

We add all the numbers together, and all the variables

15r-(8r+1)-20=0

We get rid of parentheses

15r-8r-1-20=0

We add all the numbers together, and all the variables

7r-21=0

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

7r=21

r=21/7

r=3

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