2r-9r=55

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Solution for 2r-9r=55 equation: 



2r-9r=55

We move all terms to the left:

2r-9r-(55)=0

We add all the numbers together, and all the variables

-7r-55=0

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

-7r=55

r=55/-7

r=-7+6/7

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