2r+15=55

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Solution for 2r+15=55 equation: 



2r+15=55

We move all terms to the left:

2r+15-(55)=0

We add all the numbers together, and all the variables

2r-40=0

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

2r=40

r=40/2

r=20

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