1+3r+2=9

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Solution for 1+3r+2=9 equation: 



1+3r+2=9

We move all terms to the left:

1+3r+2-(9)=0

We add all the numbers together, and all the variables

3r-6=0

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

3r=6

r=6/3

r=2

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