16=r/7=21

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Solution for 16=r/7=21 equation: 



16=r/7=21

We move all terms to the left:

16-(r/7)=0

We add all the numbers together, and all the variables

-(+r/7)+16=0

We get rid of parentheses

-r/7+16=0

We multiply all the terms by the denominator


-r+16*7=0

We add all the numbers together, and all the variables

-1r+112=0

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

-r=-112

r=-112/-1

r=+112

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