15+0.5r=30.5

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Solution for 15+0.5r=30.5 equation: 



15+0.5r=30.5

We move all terms to the left:

15+0.5r-(30.5)=0

We add all the numbers together, and all the variables

0.5r-15.5=0

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

0.5r=15.5

r=15.5/0.5

r=31

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