2=1+r+(9-1)

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Solution for 2=1+r+(9-1) equation: 



2=1+r+(9-1)

We move all terms to the left:

2-(1+r+(9-1))=0

We add all the numbers together, and all the variables

-(1+r+8)+2=0

We get rid of parentheses

-r-1-8+2=0

We add all the numbers together, and all the variables

-1r-7=0

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

-r=7

r=7/-1

r=-7

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