4r+7=91

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Solution for 4r+7=91 equation: 



4r+7=91

We move all terms to the left:

4r+7-(91)=0

We add all the numbers together, and all the variables

4r-84=0

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

4r=84

r=84/4

r=21

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