r+r+9=28

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Solution for r+r+9=28 equation: 



r+r+9=28

We move all terms to the left:

r+r+9-(28)=0

We add all the numbers together, and all the variables

2r-19=0

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

2r=19

r=19/2

r=9+1/2

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