20+12r+20=-20+15r

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Solution for 20+12r+20=-20+15r equation: 



20+12r+20=-20+15r

We move all terms to the left:

20+12r+20-(-20+15r)=0

We add all the numbers together, and all the variables

12r-(15r-20)+20+20=0

We add all the numbers together, and all the variables

12r-(15r-20)+40=0

We get rid of parentheses

12r-15r+20+40=0

We add all the numbers together, and all the variables

-3r+60=0

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

-3r=-60

r=-60/-3

r=+20

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