7r+21=42r

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Solution for 7r+21=42r equation: 



7r+21=42r

We move all terms to the left:

7r+21-(42r)=0

We add all the numbers together, and all the variables

-35r+21=0

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

-35r=-21

r=-21/-35

r=3/5

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