30=r*7

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Solution for 30=r*7 equation: 



30=r*7

We move all terms to the left:

30-(r*7)=0

We add all the numbers together, and all the variables

-(+r*7)+30=0

We get rid of parentheses

-r*7+30=0

Wy multiply elements

-7r+30=0

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

-7r=-30

r=-30/-7

r=4+2/7

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