1=-2r+9

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Solution for 1=-2r+9 equation: 



1=-2r+9

We move all terms to the left:

1-(-2r+9)=0

We get rid of parentheses

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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