7r-18=31

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Solution for 7r-18=31 equation: 



7r-18=31

We move all terms to the left:

7r-18-(31)=0

We add all the numbers together, and all the variables

7r-49=0

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

7r=49

r=49/7

r=7

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