2r-9=-1

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Solution for 2r-9=-1 equation: 



2r-9=-1

We move all terms to the left:

2r-9-(-1)=0

We add all the numbers together, and all the variables

2r-8=0

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

2r=8

r=8/2

r=4

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