49r=7r+21

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Solution for 49r=7r+21 equation: 



49r=7r+21

We move all terms to the left:

49r-(7r+21)=0

We get rid of parentheses

49r-7r-21=0

We add all the numbers together, and all the variables

42r-21=0

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

42r=21

r=21/42

r=1/2

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