21+17r=28

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Solution for 21+17r=28 equation: 



21+17r=28

We move all terms to the left:

21+17r-(28)=0

We add all the numbers together, and all the variables

17r-7=0

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

17r=7

r=7/17

r=7/17

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