7r=10r+9

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Solution for 7r=10r+9 equation: 



7r=10r+9

We move all terms to the left:

7r-(10r+9)=0

We get rid of parentheses

7r-10r-9=0

We add all the numbers together, and all the variables

-3r-9=0

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

-3r=9

r=9/-3

r=-3

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