19-15r=-20-18r

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Solution for 19-15r=-20-18r equation: 



19-15r=-20-18r

We move all terms to the left:

19-15r-(-20-18r)=0

We add all the numbers together, and all the variables

-15r-(-18r-20)+19=0

We get rid of parentheses

-15r+18r+20+19=0

We add all the numbers together, and all the variables

3r+39=0

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

3r=-39

r=-39/3

r=-13

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