17=21-4r

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Solution for 17=21-4r equation: 



17=21-4r

We move all terms to the left:

17-(21-4r)=0

We add all the numbers together, and all the variables

-(-4r+21)+17=0

We get rid of parentheses

4r-21+17=0

We add all the numbers together, and all the variables

4r-4=0

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

4r=4

r=4/4

r=1

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