(-2)-r=(-1)

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Solution for (-2)-r=(-1) equation: 



(-2)-r=(-1)

We move all terms to the left:

(-2)-r-((-1))=0

We add all the numbers together, and all the variables

-1r-1=0

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

-r=1

r=1/-1

r=-1

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