8r+20=125-13r

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Solution for 8r+20=125-13r equation: 



8r+20=125-13r

We move all terms to the left:

8r+20-(125-13r)=0

We add all the numbers together, and all the variables

8r-(-13r+125)+20=0

We get rid of parentheses

8r+13r-125+20=0

We add all the numbers together, and all the variables

21r-105=0

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

21r=105

r=105/21

r=5

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