9+2r=19

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Solution for 9+2r=19 equation: 



9+2r=19

We move all terms to the left:

9+2r-(19)=0

We add all the numbers together, and all the variables

2r-10=0

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

2r=10

r=10/2

r=5

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