17(r+21)=612

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Solution for 17(r+21)=612 equation: 



17(r+21)=612

We move all terms to the left:

17(r+21)-(612)=0

We multiply parentheses

17r+357-612=0

We add all the numbers together, and all the variables

17r-255=0

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

17r=255

r=255/17

r=15

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