21r+2=42r-19

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Solution for 21r+2=42r-19 equation: 



21r+2=42r-19

We move all terms to the left:

21r+2-(42r-19)=0

We get rid of parentheses

21r-42r+19+2=0

We add all the numbers together, and all the variables

-21r+21=0

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

-21r=-21

r=-21/-21

r=1

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