7r+19=40

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Solution for 7r+19=40 equation: 



7r+19=40

We move all terms to the left:

7r+19-(40)=0

We add all the numbers together, and all the variables

7r-21=0

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

7r=21

r=21/7

r=3

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