18r-1=19r-20

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Solution for 18r-1=19r-20 equation: 



18r-1=19r-20

We move all terms to the left:

18r-1-(19r-20)=0

We get rid of parentheses

18r-19r+20-1=0

We add all the numbers together, and all the variables

-1r+19=0

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

-r=-19

r=-19/-1

r=+19

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