-13r+20=-15-18r

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Solution for -13r+20=-15-18r equation: 



-13r+20=-15-18r

We move all terms to the left:

-13r+20-(-15-18r)=0

We add all the numbers together, and all the variables

-13r-(-18r-15)+20=0

We get rid of parentheses

-13r+18r+15+20=0

We add all the numbers together, and all the variables

5r+35=0

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

5r=-35

r=-35/5

r=-7

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