9=7r+1

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Solution for 9=7r+1 equation: 



9=7r+1

We move all terms to the left:

9-(7r+1)=0

We get rid of parentheses

-7r-1+9=0

We add all the numbers together, and all the variables

-7r+8=0

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

-7r=-8

r=-8/-7

r=1+1/7

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