20-13r=-20-15r

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Solution for 20-13r=-20-15r equation: 



20-13r=-20-15r

We move all terms to the left:

20-13r-(-20-15r)=0

We add all the numbers together, and all the variables

-13r-(-15r-20)+20=0

We get rid of parentheses

-13r+15r+20+20=0

We add all the numbers together, and all the variables

2r+40=0

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

2r=-40

r=-40/2

r=-20

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