217=7(3-4r)

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Solution for 217=7(3-4r) equation: 



217=7(3-4r)

We move all terms to the left:

217-(7(3-4r))=0

We add all the numbers together, and all the variables

-(7(-4r+3))+217=0



We calculate terms in parentheses: -(7(-4r+3)), so:

7(-4r+3)

We multiply parentheses

-28r+21

Back to the equation:

-(-28r+21)



We get rid of parentheses

28r-21+217=0

We add all the numbers together, and all the variables

28r+196=0

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

28r=-196

r=-196/28

r=-7

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