8r+9=9r

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Solution for 8r+9=9r equation: 



8r+9=9r

We move all terms to the left:

8r+9-(9r)=0

We add all the numbers together, and all the variables

-1r+9=0

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

-r=-9

r=-9/-1

r=+9

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