7r=-9+10r

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Solution for 7r=-9+10r equation: 



7r=-9+10r

We move all terms to the left:

7r-(-9+10r)=0

We add all the numbers together, and all the variables

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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