3r/7=21

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Solution for 3r/7=21 equation: 



3r/7=21

We move all terms to the left:

3r/7-(21)=0

We multiply all the terms by the denominator


3r-21*7=0

We add all the numbers together, and all the variables

3r-147=0

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

3r=147

r=147/3

r=49

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