7+28r=91

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Solution for 7+28r=91 equation: 



7+28r=91

We move all terms to the left:

7+28r-(91)=0

We add all the numbers together, and all the variables

28r-84=0

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

28r=84

r=84/28

r=3

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