r+1=2r+9

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Solution for r+1=2r+9 equation: 



r+1=2r+9

We move all terms to the left:

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

We get rid of parentheses

r-2r-9+1=0

We add all the numbers together, and all the variables

-1r-8=0

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

-r=8

r=8/-1

r=-8

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