21+4r=73

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Solution for 21+4r=73 equation: 



21+4r=73

We move all terms to the left:

21+4r-(73)=0

We add all the numbers together, and all the variables

4r-52=0

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

4r=52

r=52/4

r=13

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